ICU-22233 Fix CI cache name for Bazel build

.github/workflows/icu_ci.yml

@@ -395,11 +395,15 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: bazelbuild/setup-bazelisk@v1
+    - name: Get CI Linux runner VM version
+      id: linux-version
+      run: |
+        echo "LINUX_VERSION=$(grep -F VERSION_ID /etc/os-release | cut -d'"' -f2)" >> $GITHUB_OUTPUT
     - name: Mount bazel cache
       uses: actions/cache@v2
       with:
         path: "~/.cache/bazel"
-        key: ${{ runner.os }}-bazel
+        key: bazel-${{ runner.os }}-${{ steps.linux-version.outputs.LINUX_VERSION }}
 
     - name: Generate the data
       run: |