Pin actions/checkout at v7.0.1 SHA

.github/workflows/auto-merge.yml

diff --git a/.github/workflows/auto-merge.yml b/.github/workflows/auto-merge.yml
index 3a31eb9..3513ff3 100644
--- a/.github/workflows/auto-merge.yml
+++ b/.github/workflows/auto-merge.yml
@@ -44,7 +44,7 @@
           df -h
 
       # Checkout
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           fetch-depth: 0
           ref: ${{ env.RELEASE_BRANCH }}
@@ -135,7 +135,7 @@
       contents: write
     steps:
       # Checkout
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           fetch-depth: 0
           ref: ${{ env.RELEASE_BRANCH }}

.github/workflows/main.yml

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0beaf4c..c42684d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -52,7 +52,7 @@
         distribution: 'zulu'
 
     # Checkout
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
     # Build cache
     - name: Cache Gradle Cache

.github/workflows/release.yml

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 84e1b47..5dddecd 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -23,7 +23,7 @@
         distribution: 'zulu'
 
     # Checkout
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
     # Build cache
     - name: Cache Gradle Cache