Update dependency petitparser to v7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
petitparser (source)	dependencies	major	^6.0.1 → 7.0.1

---

Release Notes

petitparser/dart-petitparser (petitparser)

v7.0.1

Compare Source

• Dart and Flutter 3.9 compatibility.
• Minor optimization to repeating character parsers.
• Assertion on looping trim parser.

v7.0.0

Compare Source

• Dart 3.8 requirement.
• Support for unicode character parsing in all relevant character parsers.
• Most character parser constructors now uniformly support the following named arguments (breaking-change):
  • message: to customize the default error message;
  • ignoreCase: to accept lower- and upper-case variations; and
  • unicode: to decode surrogate pairs and instead of UTF-16 only.
• For consistency and better flexibility in the future, replaced optional arguments to a named ones in various other constructors: Parser.flatten({String message}), Parser.not({String message}), Parser.neg({String message}), Parser.end({String message}), Parser.starString([String? message]), Parser.plusString({String? message}), Parser.timesString(int count, {String? message}), Parser.repeatString(int min, int max, {String? message}), failure({String message}), newline({String message}), undefined({String message}) (breaking-change).
• Cleanup, simplifications, and optimizations to the codebase.
• Removal of long deprecated code.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.