Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/bump_version.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Latest Commit
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:

.github/workflows/main_branch.yaml

@@ -28,7 +28,7 @@ jobs:
           xcode-version: '15.3'
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:
@@ -50,7 +50,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:

.github/workflows/pull_request.yaml

@@ -22,7 +22,7 @@ jobs:
     if: ${{ github.event_name == 'pull_request' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:
@@ -56,7 +56,7 @@ jobs:
           xcode-version: '15.3'
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:

.github/workflows/release.yaml

@@ -25,7 +25,7 @@ jobs:
           xcode-version: '15.3'
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:

.github/workflows/release_swiftpackage.yaml

@@ -31,7 +31,7 @@ jobs:
           xcode-version: '15.3'
 
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - uses: actions/setup-java@v4
         with:
@@ -59,7 +59,7 @@ jobs:
             solana-kotlin/swiftpackage/SolanaKotlin.zip
 
       - name: Checkout package branch
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           path: _otherBranch
           ref: swiftpackage