chore(deps): update actions/checkout action to v4

Author: renovate-bot

.github/workflows/gradle-wrapper-validation.yml

@@ -6,5 +6,5 @@ jobs:
     name: "Validation"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: gradle/wrapper-validation-action@v1

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
     name: 'Test, Java ${{ matrix.java-version }}'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 50
         submodules: true

.github/workflows/release-test.yml

@@ -22,7 +22,7 @@ jobs:
     name: 'Calcite Avatica ${{ matrix.gradle-version }}'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 50
         submodules: true
@@ -67,7 +67,7 @@ jobs:
     name: 'Calcite ${{ matrix.gradle-version }}'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 50
         submodules: true
@@ -112,7 +112,7 @@ jobs:
     name: 'JMeter ${{ matrix.gradle-version }}'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 50
         submodules: true
@@ -157,7 +157,7 @@ jobs:
     name: 'Autostyle ${{ matrix.gradle-version }}'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 50
         submodules: true
@@ -202,7 +202,7 @@ jobs:
     name: 'pgjdbc ${{ matrix.gradle-version }}'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 50
         submodules: true