CI: Update to Grafana "9.5.21", "10.3.12", "10.4.14", "11.4.0"

Author: amotl

.github/workflows/tests.yml

@@ -27,7 +27,7 @@ jobs:
       matrix:
         os: [ "ubuntu-latest" ]
         python-version: [ "3.8", "3.13" ]
-        grafana-version: [ "6.7.6", "7.5.17", "8.5.27", "9.5.18", "10.3.5", "10.4.1", "11.2.2" ]
+        grafana-version: [ "6.7.6", "7.5.17", "8.5.27", "9.5.21", "10.3.12", "10.4.14", "11.4.0" ]
 
     env:
       OS_TYPE: ${{ matrix.os }}