Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
         os: [ubuntu-latest]
         java: [11, 17, 21]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:
@@ -35,7 +35,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:
@@ -67,7 +67,7 @@ jobs:
   bazel:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:
@@ -88,7 +88,7 @@ jobs:
   bazel_aspect:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:
@@ -117,7 +117,7 @@ jobs:
     runs-on: ubuntu-latest
     name: semanticdb-kotlinc
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:
@@ -139,7 +139,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:
@@ -161,7 +161,7 @@ jobs:
       matrix:
         java: [11, 17, 21]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:

.github/workflows/release-cli.yml

@@ -17,7 +17,7 @@ jobs:
       run:
         shell: nix develop --command bash -e {0}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: DeterminateSystems/nix-installer-action@v22
         with:

.github/workflows/release-docker.yml

@@ -8,7 +8,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: DeterminateSystems/nix-installer-action@v22

.github/workflows/release-maven.yml

@@ -8,7 +8,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: DeterminateSystems/nix-installer-action@v22