pest: pest_generator 2.5.6 does not compile

Describe the bug

We depend on json5 in our project which, in turn, depends on pest. A fresh cargo build, i.e. after a cargo clean, fails because of a non-exhaustive pattern on pest_meta::optimizer::OptimizedExpr::NodeTag(_, _).

To Reproduce

1. cd /tmp && git clone https://github.com/eclipse-zenoh/zenoh-flow.git --depth 1
2. cd zenoh-flow && cargo build

Expected behavior

We would expect pest_generator to compile.

Additional context

The json5 crate includes pest as following:

pest = "2.0"

The full error is as following:

error[E0004]: non-exhaustive patterns: `pest_meta::optimizer::OptimizedExpr::NodeTag(_, _)` not covered
   --> /Users/julien/.cargo/registry/src/github.com-1ecc6299db9ec823/pest_generator-2.5.6/src/generator.rs:378:11
    |
378 |     match expr {
    |           ^^^^ pattern `pest_meta::optimizer::OptimizedExpr::NodeTag(_, _)` not covered
    |
note: `pest_meta::optimizer::OptimizedExpr` defined here
   --> /Users/julien/.cargo/registry/src/github.com-1ecc6299db9ec823/pest_meta-2.6.0/src/optimizer/mod.rs:142:5
    |
114 | pub enum OptimizedExpr {
    | ----------------------
...
142 |     NodeTag(Box<OptimizedExpr>, String),
    |     ^^^^^^^ not covered
    = note: the matched value is of type `pest_meta::optimizer::OptimizedExpr`
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
    |
519 ~         }
520 +         pest_meta::optimizer::OptimizedExpr::NodeTag(_, _) => todo!()
    |

error[E0004]: non-exhaustive patterns: `pest_meta::optimizer::OptimizedExpr::NodeTag(_, _)` not covered
   --> /Users/julien/.cargo/registry/src/github.com-1ecc6299db9ec823/pest_generator-2.5.6/src/generator.rs:524:11
    |
524 |     match expr {
    |           ^^^^ pattern `pest_meta::optimizer::OptimizedExpr::NodeTag(_, _)` not covered
    |
note: `pest_meta::optimizer::OptimizedExpr` defined here
   --> /Users/julien/.cargo/registry/src/github.com-1ecc6299db9ec823/pest_meta-2.6.0/src/optimizer/mod.rs:142:5
    |
114 | pub enum OptimizedExpr {
    | ----------------------
...
142 |     NodeTag(Box<OptimizedExpr>, String),
    |     ^^^^^^^ not covered
    = note: the matched value is of type `pest_meta::optimizer::OptimizedExpr`
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
    |
651 ~         }
652 +         pest_meta::optimizer::OptimizedExpr::NodeTag(_, _) => todo!()
    |