chore(deps): bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     if: startsWith(github.repository, 'spinnaker/')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up QEMU

.github/workflows/docs_master.yml

@@ -15,12 +15,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout service repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: service
 
       - name: Checkout docs repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: spinnaker/spinnaker.io
           path: docs

.github/workflows/pr.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Set up QEMU

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       # Given a tag, determine what branch we are on, so we can bump dependencies in the correct branch