Bump build_runner from 2.15.0 to 2.15.1 in /example in the pub-example group

[dependabot]

Bumps the pub-example group in /example with 1 update: build_runner.

Updates build_runner from 2.15.0 to 2.15.1

Release notes

Sourced from build_runner's releases.

package:build_runner v2.15.1

• Pass Dart SDK --packages arg to builder compiles, so they can be compiled with different packages to the current version solve.
• More efficient watching for file changes in workspaces and other setups with nested packages.
• Support builders with no declared outputs. They can't output anything, but they can do processing, write log messages and choose whether to fail the build.
• Mention in command usage that --define values are parsed as JSON with a fallback.
• Performance: reduce size of serialized build state when there are optional outputs that are not written.
• Bug fix: handle errors from post process builders in previous runs without crashing.
• Bug fix: fix dart run build_runner test to correctly pass arguments after -- to the test process.
• Bug fix: fix crash if a resolved Dart source contains invalid utf8.
• Bug fix: fix incorrect output when builder code changes during builder compile.
• Bug fix: do a clean build when switching between a workspace build and a package build, as incremental builds were sometimes incorrect.
• Require Dart 3.8.0.

Commits

• 565856b Release build 4.0.7, build_runner 3.15.1. (#5010)
• 76f0f89 Fix workspace vs package build config conflict (#5008)
• 8921c3f Formatting changes due to latest dev SDK. (#5007)
• e999ea4 Fix incorrect build due to racy builder changes. (#4988)
• d2a2f4f Bump SDK upper bounds. (#5006)
• a72038d Set flattenBuild in passed ReaderWriter. (#5004)
• ea0cf6b fix(build_daemon): reject cross-origin WebSocket handshakes (CSWSH) (#4992)
• ae52e61 Use BuiltList.of instead of BuiltList.from. (#5003)
• a8e949c Fix trigger evaluation reading ungenerated parts. (#5000)
• 39353ef Bump actions/cache from 5.0.5 to 6.1.0 in the github-actions group (#5002)
• Additional commits viewable in compare view

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