Bump timescale version, remove pg14 support

Author: Ignas

.github/workflows/build.yaml

@@ -4,7 +4,7 @@ on: push
 
 env:
   # renovate datasource=github-releases depName=timescale/timescaledb
-  TIMESCALE_VERSION: 2.19.3
+  TIMESCALE_VERSION: 2.21.0
 
 jobs:
   build:
@@ -26,10 +26,7 @@ jobs:
           - postgres_version: "15"
             # renovate datasource=docker depName=ghcr.io/cloudnative-pg/postgresql
             cnpg_version: 15.13-9
-          - postgres_version: "14"
-            # renovate datasource=docker depName=ghcr.io/cloudnative-pg/postgresql
-            cnpg_version: 14.18-9
-    steps:
+w    steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Get CloudNativePG version