Bump actions/checkout from 2 to 3 (#835)

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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Cache pip
       uses: actions/cache@v2
       with:

.github/workflows/check.yml

@@ -12,7 +12,7 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Cache pip
       uses: actions/cache@v2
       with:

.github/workflows/flawfinder-analysis.yml

@@ -22,7 +22,7 @@ jobs:
       security-events: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: flawfinder_scan
         uses: david-a-wheeler/flawfinder@2.0.19

.github/workflows/m5atom-matrix.yml

@@ -7,7 +7,7 @@ jobs:
   remote-run:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Cache pip
       uses: actions/cache@v2
       with: