fix: pin bloc_test and mocktail to specific version constraints

Replace `any` with `^10.0.0` and `^1.0.4` respectively, matching the
versions that are already resolved in pubspec.lock.

https://claude.ai/code/session_011cEYpuo76EMamkGvpnuPNZ

Author: claude

pubspec.yaml

@@ -75,8 +75,8 @@ dev_dependencies:
   # package. See that file for information about deactivating specific lint
   # rules and activating additional ones.
   flutter_lints: ^6.0.0
-  bloc_test: any
-  mocktail: any
+  bloc_test: ^10.0.0
+  mocktail: ^1.0.4
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec