Use actions/checkout@v6 major tag

Author: dduugg

.github/workflows/cd.yml

@@ -37,7 +37,7 @@
         matrix:
           ruby-platform: ${{ fromJSON(needs.ci-data.outputs.result).supported-ruby-platforms }}
       steps:
-        - uses: actions/checkout@v6.0.3
+        - uses: actions/checkout@v6
 
         - uses: ruby/setup-ruby@v1
           with:
@@ -82,7 +82,7 @@
       permissions:
         contents: write  # Required for creating releases
       steps:
-        - uses: actions/checkout@v6.0.3
+        - uses: actions/checkout@v6
 
         - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
           with:

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
         ruby: ${{ fromJSON(needs.ci-data.outputs.result).stable-ruby-versions }}
         rust: ["stable"]
     steps:
-      - uses: actions/checkout@v6.0.3
+      - uses: actions/checkout@v6
       - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
           ruby-version: ${{ matrix.ruby }}
@@ -45,7 +45,7 @@ jobs:
     name: "RSpec (ruby-version-file)"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.3
+      - uses: actions/checkout@v6
       - uses: oxidize-rb/actions/setup-ruby-and-rust@v1
         with:
           rustup-toolchain: stable
@@ -59,7 +59,7 @@ jobs:
     name: "Type Check"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.3
+      - uses: actions/checkout@v6
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with: