Bump actions/checkout from 2 to 3.1.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.1.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3.1.0)

---
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/build.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - id: setup-env
         uses: cisagov/setup-env-github-action@develop
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - id: setup-python
         uses: actions/setup-python@v2
         with:
@@ -118,7 +118,7 @@ jobs:
           - "3.9"
           - "3.10"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - id: setup-python
         uses: actions/setup-python@v2
         with:
@@ -161,7 +161,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: test
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - id: setup-python
         uses: actions/setup-python@v2
         with:
@@ -205,7 +205,7 @@ jobs:
           - "3.9"
           - "3.10"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - id: setup-python
         uses: actions/setup-python@v2
         with:
@@ -249,7 +249,7 @@ jobs:
           - 3.7
           - 3.8
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - name: Get short SHA for the commit being used
         run: |
           echo "GH_SHORT_SHA=${GITHUB_SHA::7}" >> $GITHUB_ENV

.github/workflows/codeql-analysis.yml

@@ -34,7 +34,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3.1.0
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
           - 3.7
           - 3.8
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3.1.0
       - name: Build Docker image
         # DOCKER_BUILDKIT=1 tells Docker to use BuildKit when building the
         # image per: