Revert "Don’t specify 8.x as Bazel release for CI"

This reverts commit 5f7ba8c.

Bazel 9 is now released.

Author: phst

.github/workflows/bazel-test.yaml

@@ -1,4 +1,4 @@
-# Copyright 2021-2025 Google LLC
+# Copyright 2021-2026 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -25,7 +25,7 @@ jobs:
       matrix:
         # We don’t use the GitHub matrix support for the Emacs toolchain to
         # allow Bazel to cache intermediate results between the test runs.
-        bazel: [7.4.0, 7.x, latest]
+        bazel: [7.4.0, 7.x, 8.x, latest]
         os: [ubuntu-latest, macos-latest, windows-latest]
         cc: [gcc-14, clang, msvc]
         exclude: