Update ghcr.io/cloudnative-pg/postgresql Docker tag to v18

.gitea/workflows/lint-test.yaml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0
 

.gitea/workflows/release-charts-cloudflared.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
 
       - name: Set up Helm
         uses: azure/setup-helm@v4

.gitea/workflows/release-charts-generic-device-plugin.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
 
       - name: Set up Helm
         uses: azure/setup-helm@v4

.gitea/workflows/release-charts-gitea-actions.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
 
       - name: Set up Helm
         uses: azure/setup-helm@v4

.gitea/workflows/release-charts-postgres-cluster.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-js
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
 
       - name: Set up Helm
         uses: azure/setup-helm@v4

.gitea/workflows/renovate.yaml

@@ -16,7 +16,7 @@ jobs:
     container: ghcr.io/renovatebot/renovate:42
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
 
       - name: Renovate
         run: renovate

.github/workflows/release-charts.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
         with:
           fetch-depth: 0