Mark date-locale-hour flakey & drop a useless cache action (#11093)

.github/workflows/CICD.yml

@@ -251,8 +251,6 @@ jobs:
     - uses: actions/checkout@v6
       with:
         persist-credentials: false
-    - uses: dtolnay/rust-toolchain@stable
-    - uses: Swatinem/rust-cache@v2
     - name: "`cargo update` testing"
       shell: bash
       run: |

.github/workflows/ignore-intermittent.txt

@@ -1,3 +1,4 @@
+tests/date/date-locale-hour
 tests/pr/bounded-memory
 tests/tail/inotify-dir-recreate
 tests/tail/overlay-headers