chore(deps): update postgres docker tag to v15.6 (#1290)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/gradle.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
     services:
       database:
-        image: postgres:15.3-alpine
+        image: postgres:15.6-alpine
         ports:
           - 5432:5432
         env:

.github/workflows/node-script-test.yml

@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-22.04
     services:
       database:
-        image: postgres:15.3-alpine
+        image: postgres:15.6-alpine
         ports:
           - 5432:5432
         env:

.github/workflows/release-server.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
     services:
       database:
-        image: postgres:15.3-alpine
+        image: postgres:15.6-alpine
         ports:
           - 5432:5432
         env:

.github/workflows/server-load-test.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-22.04
     services:
       database:
-        image: postgres:15.3-alpine
+        image: postgres:15.6-alpine
         ports:
           - 5432:5432
         env:

.github/workflows/server-ui-functional-test.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-22.04
     services:
       database:
-        image: postgres:15.3-alpine
+        image: postgres:15.6-alpine
         ports:
           - 5432:5432
         env:

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 
 services:
   postgres:
-    image: postgres:15.3-alpine
+    image: postgres:15.6-alpine
     environment:
       - POSTGRES_USER=testuser
       - POSTGRES_PASSWORD=testpass