docs: update checkout@v3, create-pull-request@v4

Signed-off-by: Erik Kristensen <erik@erikkristensen.com>

action/README.md

@@ -64,7 +64,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Flux CLI
         uses: fluxcd/flux2/action@main
       - name: Check for updates
@@ -76,7 +76,7 @@ jobs:
           VERSION="$(flux -v)"
           echo "flux_version=$VERSION" >> $GITHUB_OUTPUT
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v3
+        uses: peter-evans/create-pull-request@v4
         with:
             token: ${{ secrets.GITHUB_TOKEN }}
             branch: update-flux
@@ -189,7 +189,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Flux CLI
         uses: fluxcd/flux2/action@main
       - name: Setup Kubernetes Kind