Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/azure-integration.yml

@@ -24,7 +24,7 @@ jobs:
       matrix:
         java-version: [ 17, 21 ]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-java@v5
       with:
         distribution: 'temurin'
@@ -53,7 +53,7 @@ jobs:
     #  !contains(needs.*.result, 'cancelled') &&
     #  !contains(needs.*.result, 'failure')
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-java@v5
       with:
         distribution: 'temurin'

.github/workflows/gcs-integration.yml

@@ -24,7 +24,7 @@ jobs:
       matrix:
         java-version: [ 17, 21 ]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-java@v5
       with:
         distribution: 'temurin'

.github/workflows/integration.yml

@@ -21,7 +21,7 @@ jobs:
       with:
         java-version: 17
         distribution: 'temurin'
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Maven repository caching
       uses: actions/cache@v5
       with:

.github/workflows/linux.yml

@@ -13,7 +13,7 @@ jobs:
   openjdk17:
     runs-on: [ubuntu-22.04]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 17
       uses: actions/setup-java@v5
       with:
@@ -35,7 +35,7 @@ jobs:
   openjdk21:
     runs-on: [ubuntu-22.04]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 21
       uses: actions/setup-java@v5
       with:
@@ -57,7 +57,7 @@ jobs:
   openjdk25:
     runs-on: [ubuntu-22.04]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
@@ -80,7 +80,7 @@ jobs:
   QA:
     runs-on: [ubuntu-22.04]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 17
       uses: actions/setup-java@v5
       with:

.github/workflows/macos.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: [macos-latest]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 17
       uses: actions/setup-java@v5
       with:

.github/workflows/windows.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: [windows-latest]
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Set up JDK 17
       uses: actions/setup-java@v5
       with: