chore: bump intl from 0.17.0 to 0.18.0 (#1105)

Bumps [intl](https://github.com/dart-lang/intl) from 0.17.0 to 0.18.0.
- [Release notes](https://github.com/dart-lang/intl/releases)
- [Changelog](https://github.com/dart-lang/intl/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dart-lang/intl/commits)

---
updated-dependencies:
- dependency-name: intl
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pubspec.yaml

@@ -34,7 +34,7 @@ dependencies:
 
 dev_dependencies:
   coverage: ^1.0.2
-  intl: ^0.17.0
+  intl: ">=0.17.0 <0.19.0"
   lints: ^2.0.0
   mocktail: ^0.3.0
   test: ^1.21.0