Add Postgres 16 support, release 5.0.0 · pganalyze/pg_query.rs@776b2f8

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/cache@v2, actions-rs/toolchain@v1, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Run tests: src/lib.rs#L52

unused import: `node_structs::*`

`pg_query` (lib) generated 1 warning (run `cargo fix --lib -p pg_query` to apply 1 suggestion)

Run tests: tests/parse_plpgsql_tests.rs#L3

unused import: `support::*`

`pg_query` (test "parse_plpgsql_tests") generated 1 warning (run `cargo fix --test "parse_plpgsql_tests"` to apply 1 suggestion)

Build pg_query: src/lib.rs#L52

unused import: `node_structs::*`

`pg_query` (lib) generated 1 warning (run `cargo fix --lib -p pg_query` to apply 1 suggestion)

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