Merge pull request #25 from ChristianTackeGSI/main

chore: upgrade checkout step to v4

Author: mxmehl

.github/workflows/selftest.yml

@@ -15,7 +15,7 @@ jobs:
   test-self:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: REUSE version
       uses: ./
       with:
@@ -33,7 +33,7 @@ jobs:
   test-majorversion:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: REUSE Compliance Check
       uses: fsfe/reuse-action@v2
       with:

README.md

@@ -39,15 +39,15 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: REUSE Compliance Check
       uses: fsfe/reuse-action@v2
 ```
 
 If you would like to run other subcommands, you could use the following snippet which outputs a the SPDX bill of materials:
 
 ```yml
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: REUSE SPDX SBOM
       uses: fsfe/reuse-action@v2
       with:
@@ -57,7 +57,7 @@ If you would like to run other subcommands, you could use the following snippet
 In the same fashion, it is possible to add optional arguments like `--include-submodules`:
 
 ```yml
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: REUSE Compliance Check
       uses: fsfe/reuse-action@v2
       with: