core: Plex integration not working with 2021.5.1

The problem

After upgrading to 2021.5.1, I’m getting issue with Plex Integration

What is version of Home Assistant Core has the issue?

core-2021.5.1

What was the last working version of Home Assistant Core?

core-2021.3.4

What type of installation are you running?

Home Assistant Container

Integration causing the issue

Plex

Link to integration documentation on our website

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

Logger: homeassistant.components.plex
Source: components/plex/__init__.py:111
Integration: Plex Media Server (documentation, issues)
First occurred: 12:18:25 AM (2 occurrences)
Last logged: 12:26:54 AM

Plex server (http://1.2.3.4:32400) could not be reached: [HTTPSConnectionPool(host='plex.tv', port=443): Max retries exceeded with url: /users/account (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0xae2d0700>: Failed to establish a new connection: [Errno -3] Try again'))]
Plex server (http://1.2.3.4:32400) could not be reached: [HTTPSConnectionPool(host='plex.tv', port=443): Max retries exceeded with url: /users/account (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0xa7e30c28>: Failed to establish a new connection: [Errno -3] Try again'))]

Additional information

No response