Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v3)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/autochangelog.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event.pull_request.merged == true
     steps:
-      - uses: /actions/checkout@v2
+      - uses: /actions/checkout@v3
         with:
           ref: master
       - name: Update repository to master

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     name: Run Linters
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Ensure +x on CI directory
         run: |
           chmod -R +x ./tools/ci
@@ -28,7 +28,7 @@ jobs:
     name: DreamChecker
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Cache SpacemanDMM
         uses: actions/cache@v2
@@ -56,7 +56,7 @@ jobs:
     name: Integration Tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Ensure +x on CI directory
         run: |
           chmod -R +x ./tools/ci

.github/workflows/render_nanomaps.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Clone
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Branch
       run: |