Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Checkout submodules # This is required, don't use submodules flag for actions/checkout instead.
         run: git submodule update --init --recursive --force
       - uses: actions/setup-java@v4

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Checkout submodules # This is required, don't use submodules flag for actions/checkout instead.
         run: git submodule update --init --recursive --force
       - uses: actions/setup-java@v4

.github/workflows/update-go-dependencies.yml

@@ -10,7 +10,7 @@ jobs:
   update-go-dependencies:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Checkout submodules # This is required, don't use submodules flag for actions/checkout instead.
         run: git submodule update --init --recursive --force
       - uses: actions/setup-go@v6