Bump pool to c40cc32eabecb9d60f1045d1403108d968805f9a
Bump pool to c40cc32eabecb9d60f1045d1403108d968805f9a

Changes:
```
> git log --format="%C(auto) %h %s" 7abe634..c40cc32
 https://dart.googlesource.com/pool.git/+/c40cc32 Merge pull request #56 from dart-lang/devoncarew-patch-1
 https://dart.googlesource.com/pool.git/+/5ce105e test against Dart 2.15
 https://dart.googlesource.com/pool.git/+/6e9885f switch to package:lints
 https://dart.googlesource.com/pool.git/+/430b860 rev to a dev version
 https://dart.googlesource.com/pool.git/+/a1e710d Update pubspec.yaml
 https://dart.googlesource.com/pool.git/+/4fcbdb9 Use latest CI setup, test on oldest supported SDK (#55)
 https://dart.googlesource.com/pool.git/+/005271c Merge pull request #54 from dart-lang/franklinyow-patch-1
 https://dart.googlesource.com/pool.git/+/b2dbf29 Update LICENSE
 https://dart.googlesource.com/pool.git/+/878759a Prepare to publish for stable null safety (#52)
 https://dart.googlesource.com/pool.git/+/c065054 Migrate to GitHub Actions (#51)
 https://dart.googlesource.com/pool.git/+/96b6734 Merge pull request #48 from dart-lang/pq-analyze
 https://dart.googlesource.com/pool.git/+/9688715 migrate from `dartanalyzer` to `dart analyze`

```

Diff: https://dart.googlesource.com/pool.git/+/7abe634002a1ba8a0928eded086062f1307ccfae~..c40cc32eabecb9d60f1045d1403108d968805f9a/
Change-Id: I10e7d7c2b8a4168770da5dfa8211bba9ce37a1f5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/244722
Commit-Queue: Devon Carew <e996497f4f2225f0ee7a9f4d1696ee710b488b66@google.com>
Reviewed-by: Nate Bosch <dc212c74d8afde9c690fdd09e74d3e5c5d5a3de0@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk