Bump build_runner from 2.4.7 to 2.4.8

Bumps [build_runner](https://github.com/dart-lang/build) from 2.4.7 to 2.4.8.
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](dart-lang/build@build_runner-v2.4.7...build_runner-v2.4.8)

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

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

pubspec.lock

@@ -85,10 +85,10 @@ packages:
     dependency: "direct dev"
     description:
       name: build_runner
-      sha256: "67d591d602906ef9201caf93452495ad1812bea2074f04e25dbd7c133785821b"
+      sha256: "581bacf68f89ec8792f5e5a0b2c4decd1c948e97ce659dc783688c8a88fbec21"
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.7"
+    version: "2.4.8"
   build_runner_core:
     dependency: transitive
     description:

pubspec.yaml

@@ -53,7 +53,7 @@ dev_dependencies:
   # rules and activating additional ones.
   flutter_lints: ^3.0.1
   riverpod_generator: ^2.3.3
-  build_runner: ^2.4.7
+  build_runner: ^2.4.8
   custom_lint: ^0.5.11
   riverpod_lint: ^2.1.1
   isar_generator: ^3.1.0+1