grove.py: Errors when installing on a Raspberry Pi running Bullseye

When running this script on a Raspberry Pi running Bullseye, I get the following errors:

pi@tracker:~ $ curl -sL https://github.com/Seeed-Studio/grove.py/raw/master/install.sh | sudo bash -s -
deb https://seeed-studio.github.io/pi_repo/ stretch main
Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
100  3822  100  3822    0     0  15991      0 --:--:-- --:--:-- --:--:-- 15991
OK
Get:1 https://seeed-studio.github.io/pi_repo stretch InRelease [3,167 B]
Hit:2 http://raspbian.raspberrypi.org/raspbian bullseye InRelease                                                                                
Hit:3 http://archive.raspberrypi.org/debian bullseye InRelease                                                      
Get:4 https://seeed-studio.github.io/pi_repo stretch/main armhf Packages [31.0 kB]
Fetched 34.1 kB in 1s (32.2 kB/s) 
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
All packages are up to date.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python3-pip

E: Package 'python-pip' has no installation candidate
dpkg-query: package 'python-pip' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python3-pip

E: Package 'python-pip' has no installation candidate
dpkg-query: package 'python-pip' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  python3-pip

E: Package 'python-pip' has no installation candidate
dpkg-query: package 'python-pip' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
python3-pip is already the newest version (20.3.4-4+rpt1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Enable I2C interface ...
I2C interface enabled...
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-rpi.gpio is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python-rpi.gpio' has no installation candidate
dpkg-query: package 'python-rpi.gpio' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-rpi.gpio is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python-rpi.gpio' has no installation candidate
dpkg-query: package 'python-rpi.gpio' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package python-rpi.gpio is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python-rpi.gpio' has no installation candidate
dpkg-query: package 'python-rpi.gpio' is not installed and no information is available
Use dpkg --info (= dpkg-deb --info) to examine archive files.
-------------------------------------------------------
     Grove.py installation FAILED, FAILED, FAILED      
-------------------------------------------------------

This looks like the Python2 packages are not compatible with bullseye, which makes sense as Python2 has been deprecated. It would be nice if the script was update to only install Python3 libraries to avoid these errors.