Update GH actions to v4.

Author: asfernandes

.github/workflows/increment-build-number.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           token: ${{ secrets.FIREBIRD_INC_BUILDNUM }}
           persist-credentials: true

.github/workflows/qa.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout firebird-qa
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 1
           repository: FirebirdSQL/firebird-qa

.github/workflows/trim-trailing-spaces.yml

@@ -17,7 +17,7 @@ jobs:
           - v4.0-release
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ matrix.branch }}
           persist-credentials: false