Update README.md for new major version of action @V3 -> @v4

README.md

@@ -41,15 +41,15 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: REUSE Compliance Check
-      uses: fsfe/reuse-action@v3
+      uses: fsfe/reuse-action@v4
 ```
 
 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@v4
     - name: REUSE SPDX SBOM
-      uses: fsfe/reuse-action@v3
+      uses: fsfe/reuse-action@v4
       with:
         args: spdx
 ```
@@ -59,7 +59,7 @@ In the same fashion, it is possible to add optional arguments like `--include-su
 ```yml
     - uses: actions/checkout@v4
     - name: REUSE Compliance Check
-      uses: fsfe/reuse-action@v3
+      uses: fsfe/reuse-action@v4
       with:
         args: --include-submodules lint
 ```