Bump tools to 545d7e1c73ce21b8c91f638021f9d487d324a501

This will customize the consent message based on the `dart` or `flutter`
entry points and allow unified_analytics to honor the legacy analytics
opt-out.

Changes:
```
> git log --format="%C(auto) %h %s" 2308c67..545d7e1
 https://dart.googlesource.com/tools.git/+/545d7e1 Honor legacy opt out status (80)

```

Diff: https://dart.googlesource.com/tools.git/+/2308c672e0d7446f5bfdba96594b41f26fa24a2e..545d7e1c73ce21b8c91f638021f9d487d324a501/
Bug: dart-lang/tools#74
Bug: dart-lang/tools#82
Change-Id: I36bffde69b6d7f798a40f140ca5e838336d81d3f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/295742
Reviewed-by: Elias Yishak <eliasyishak@google.com>
Commit-Queue: Elias Yishak <eliasyishak@google.com>
Commit-Queue: Janice Collins <jcollins@google.com>
Auto-Submit: Janice Collins <jcollins@google.com>

Author: jcollins-g

Diff for: DEPS

@@ -172,7 +172,7 @@ vars = {
   "test_descriptor_rev": "aa11162f55a93fc6cefc927c5189b5f74decb957",
   "test_process_rev": "946bc27abd9726c4dadb9afae7c56f55df5945ed",
   "test_reflective_loader_rev": "a85a930ad3736f93b96f6cc104d3576c1ae19e0e",
-  "tools_rev": "2308c672e0d7446f5bfdba96594b41f26fa24a2e",
+  "tools_rev": "545d7e1c73ce21b8c91f638021f9d487d324a501",
   "typed_data_rev": "d85363d2efb333afce07ec409a529ec32986e1a2",
   "usage_rev": "0698711985b332432ce9a901bbbd3b1ed227b090",
   "vector_math_rev": "7dec98433b3e016fbe49107ad4320b31f519eb70",