GH actions: update Ubuntu version for GRASS tests - 22.04 -> 24.04 (#422)

GRASS tests were ignored in 8c1f492

Author: pesekon2

.github/workflows/grass_provider.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     container:
       image: osgeo/grass-gis:releasebranch_8_3-debian
 
@@ -37,7 +37,7 @@ jobs:
     strategy:
       fail-fast: false
 
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     container:
       image: osgeo/grass-gis:releasebranch_8_3-debian