Bump build_runner from 2.1.8 to 2.1.10 in /experimental/web_dashboard (#1098)

Bumps [build_runner](https://github.com/dart-lang/build) from 2.1.8 to 2.1.10.
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](https://github.com/dart-lang/build/compare/build_daemon-v2.1.8...build_runner-v2.1.10)

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

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

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

experimental/web_dashboard/pubspec.lock

@@ -56,7 +56,7 @@ packages:
       name: build_daemon
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "3.1.0"
   build_resolvers:
     dependency: transitive
     description:
@@ -70,7 +70,7 @@ packages:
       name: build_runner
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.8"
+    version: "2.1.10"
   build_runner_core:
     dependency: transitive
     description: