Stop running ci tests against pg 10 (#2807)

Since it's not supported anymore

Author: roji

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-22.04, windows-2022]
-        pg_major: [15, 14, 13, 12, 11, 10]
+        pg_major: [15, 14, 13, 12, 11]
         config: [Release]
         include:
           - os: ubuntu-22.04