Bump shelf from 1.3.1 to 1.3.2 (#2337)
Bump shelf from 1.3.1 to 1.3.2 (#2337)

Bumps [shelf](https://github.com/dart-lang/shelf/tree/master/pkgs) from 1.3.1 to 1.3.2.
- [Release notes](https://github.com/dart-lang/shelf/releases)
- [Commits](https://github.com/dart-lang/shelf/commits/shelf-v1.3.2/pkgs)

---
updated-dependencies:
- dependency-name: shelf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
dart-lang/dart-pad,dart-lang/dart-pad,dart-lang/dart-pad,dart-lang/dart-pad