change test from pg14 -> pg15beta3

Author: ImreSamu

.github/workflows/buildx.yml

@@ -26,23 +26,23 @@ jobs:
         # Not for the `*-master``building.  Emulation takes lot of times!
         #`
         # comments: 2022-09-07
-        #   'linux/arm/v7' - debian: Unable to locate package postgresql-14-postgis-3;
-        #   'linux/arm/v6' - debian: Unable to locate package postgresql-14-postgis-3;
+        #   'linux/arm/v7' - debian: Unable to locate package postgresql-??-postgis-3;
+        #   'linux/arm/v6' - debian: Unable to locate package postgresql-??-postgis-3;
         #   'linux/s390x'    [alpine|debian] failed test.
         #   'linux/mips64le' [alpine|debian] failed test.
         #   ...
         #
         # succesful tests matrix:
         platforms: ['linux/arm64','linux/arm/v7','linux/arm/v6','linux/386','linux/ppc64le']
-        postgres: [14]
+        postgres: ['15beta3']
         postgis: ['3.2']
         variant: [alpine]
         include:
-          - postgres: 14
+          - postgres: '15beta3'
             postgis: '3.2'
             variant: 'default'
             platforms: 'linux/arm64'
-          - postgres: 14
+          - postgres: '15beta3'
             postgis: '3.2'
             variant: 'default'
             platforms: 'linux/ppc64le'