Bump tools to a0dda7e50bcd99fd3be8512cf546d872ba39e046

Changes:
```
> git log --format="%C(auto) %h %s" a433200..a0dda7e
 https://dart.googlesource.com/tools.git/+/a0dda7e5 [coverage] Switch from package:pubspec_parse to package:yaml (2103)
 https://dart.googlesource.com/tools.git/+/89997b0d [coverage] Partial workspace support (2095)

```

Diff: https://dart.googlesource.com/tools.git/+/a433200cf62b2da0a02602f138ae25d61b63739c..a0dda7e50bcd99fd3be8512cf546d872ba39e046/
Change-Id: Id534906f34979ecd2fbbc14866d1404736ca27d8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/431620
Commit-Queue: Liam Appelbe <[email protected]>
Auto-Submit: Devon Carew <[email protected]>
Reviewed-by: Liam Appelbe <[email protected]>

Author: devoncarew

DEPS

@@ -145,7 +145,7 @@ vars = {
   "sync_http_rev": "dc54465f07d9652875deeade643256dafa2fbc6c",
   "tar_rev": "5a1ea943e70cdf3fa5e1102cdbb9418bd9b4b81a",
   "test_rev": "42a6d333d96b4b0964d356b9a29ca47ccdb43691",
-  "tools_rev": "a433200cf62b2da0a02602f138ae25d61b63739c",
+  "tools_rev": "a0dda7e50bcd99fd3be8512cf546d872ba39e046",
   "vector_math_rev": "13f185f7e97d559e003f5ac79201da12f9a01049",
   "web_rev": "f1becf07db9faa56559d2844c3c6d430dc9b37de",
   "webdev_rev": "5dbb30ebc695ad2ecc01fa8eae4e0494c199e1bc",