chore(deps): revert build_runner upgrades

Go back, if it works.

Author: realth000

pubspec.lock

@@ -85,10 +85,10 @@ packages:
     dependency: transitive
     description:
       name: build
-      sha256: "51dc711996cbf609b90cbe5b335bbce83143875a9d58e4b5c6d3c4f684d3dda7"
+      sha256: cef23f1eda9b57566c81e2133d196f8e3df48f244b317368d65c5943d91148f0
       url: "https://pub.dev"
     source: hosted
-    version: "2.5.4"
+    version: "2.4.2"
   build_config:
     dependency: transitive
     description:
@@ -109,26 +109,26 @@ packages:
     dependency: transitive
     description:
       name: build_resolvers
-      sha256: ee4257b3f20c0c90e72ed2b57ad637f694ccba48839a821e87db762548c22a62
+      sha256: b9e4fda21d846e192628e7a4f6deda6888c36b5b69ba02ff291a01fd529140f0
       url: "https://pub.dev"
     source: hosted
-    version: "2.5.4"
+    version: "2.4.4"
   build_runner:
     dependency: "direct dev"
     description:
       name: build_runner
-      sha256: "382a4d649addbfb7ba71a3631df0ec6a45d5ab9b098638144faf27f02778eb53"
+      sha256: "058fe9dce1de7d69c4b84fada934df3e0153dd000758c4d65964d0166779aa99"
       url: "https://pub.dev"
     source: hosted
-    version: "2.5.4"
+    version: "2.4.15"
   build_runner_core:
     dependency: transitive
     description:
       name: build_runner_core
-      sha256: "85fbbb1036d576d966332a3f5ce83f2ce66a40bea1a94ad2d5fc29a19a0d3792"
+      sha256: "22e3aa1c80e0ada3722fe5b63fd43d9c8990759d0a2cf489c8c5d7b2bdebc021"
       url: "https://pub.dev"
     source: hosted
-    version: "9.1.2"
+    version: "8.0.0"
   built_collection:
     dependency: transitive
     description:

pubspec.yaml

@@ -98,7 +98,8 @@ dependency_overrides:
       path: pkgs/jni
 
 dev_dependencies:
-  build_runner: ^2.5.4
+  # Pinned on 2.4.x version for working with null-aware-elements issue in GitHub CI.
+  build_runner: 2.4.15
   custom_lint: ^0.7.6
   dart_mappable_builder: ^4.5.0
   flutter_launcher_icons: ^0.14.4