Update lalrpop requirement from 0.20 to 0.21

[dependabot]

Updates the requirements on lalrpop to permit the latest version.

Changelog

Sourced from lalrpop's changelog.

0.20.2 (2024-02-**)

Special thanks to our newest maintainers, Daniel Burgener and Patrick LaFontaine for helping to coordinate this release.

Features

• Lalrpop no longer depends on the is-terminal crate (thanks to Kmeakin!)
• Better performance with the default lexer using the underlying regex-automata crate (thanks to QuarticCat!)
• Allow the catch-all _ case for token matching can now be set to a higher precedence in match (thanks to fpoli!)
• Fewer clippy lints triggered in generated code
• Lalrpop now traverses symlinks to find .lalrpop files(thanks mbid!)
• Lalrpop now supports block comments including nestings(thanks seanbright!)

Bugfixes

• Lalrpop now uses the ascii-aware space regex when the unicode feature is not enabled (thanks to QuarticCat!)
• Dangling symlinks in crate no longer cause build failure (thanks to legeana for the report!)
• Unicode is now set as a default feature in lalrpop-util to align with lalrpop's defaults

Compatibility note

• MSRV increased to 1.70.
• process_root_unconditionally now correctly lints as having been deprecated.
• Internal types which lead with a __ and should not be relied upon are no longer publicly exposed (thanks to arnaudgolfouse!)
• Lalrpop files containing a space in their name now return an error.

0.20.1 (2024-02-**)

Yanked

0.20.0 (2023-05-02)

Bringing back 0.19.10 patches and further enhancement.

Breaking changes

• Types and enums name with capitalized acronyms are renamed to camelCase
• Minimum rust supported version is now 1.64
• New unicode feature is added to enable regex/unicode and regex-syntax/unicode. Building lalrpop with --no-default-features may be broken without adding it.

Features

• faster compilation time by up to 2x
• expected tokens in failed parses are more accurate
• support for unicode when using builtin tokenizer

... (truncated)

Commits

• 8c4d4bc Release 0.20.2 (#871)
• 0b244af Document the cheat sheet in the README (#868)
• a08d407 Kick the tires on a documentation cheatsheet (#867)
• 5eb7d1e <= Rust 1.76 lints (#866)
• c85a1a3 Consistent LALR docs and clippy (#863)
• b1cfbec Set unicode as a default feature in lalrpop-util (#849)
• 872928b Traverse into symlinks to dirs (#852)
• c5827f5 Add symlinks to license files (#855)
• 536e8fb Add precedence and assoc to the docs (#859)
• 61e1e19 Grammar file block comment support (#840)
• Additional commits viewable in compare view

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