GHA: Remove pg13 testing, add a line for latest

Author: robe2

.github/workflows/ci.yml

@@ -29,12 +29,10 @@ jobs:
         #- { tag: pg13-geos39-gdal31-proj71, mode: tests }
         #- { tag: pg13-geos39-gdal31-proj71, mode: coverage }
         #- { tag: pg13-geos39-gdal31-proj71, mode: usan_gcc }
-        - { tag: pg13-clang-geos39-gdal31-proj71, mode: usan_clang }
+        #- { tag: pg14-clang-geos39-gdal31-proj71, mode: usan_clang }
         # Run tests with different dependency combinations
-        # - { tag: latest, mode: tests }
+        - { tag: latest, mode: tests }
         - { tag: latest, mode: garden }
-        - { tag: pg13-geos38-gdal31-proj71, mode: tests }
-        - { tag: pg12-geos38-gdal30-proj611, mode: tests }
 
     runs-on: ubuntu-latest
     steps: