ICU-22233 Use separate Bazel cache keys per OS.

diff --git a/.github/workflows/icu_ci.yml b/.github/workflows/icu_ci.yml
index dd3222d821ec8924f2cc2d343fd1b5987decce26..e5b002a4fd8f525081494574a9f5cc53c24c0f8a 100644 (file)
--- a/.github/workflows/icu_ci.yml
+++ b/.github/workflows/icu_ci.yml
@@ -486,7 +486,7 @@ jobs:
 
   # Build Unicode update tools
   unicode-update-tools:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
     - uses: bazelbuild/setup-bazelisk@v1
@@ -494,7 +494,7 @@ jobs:
       uses: actions/cache@v2
       with:
         path: "~/.cache/bazel"
-        key: bazel
+        key: ${{ runner.os }}-bazel
 
     - name: Generate the data
       run: |