Update actions/checkout action to v2 (#14)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

.github/workflows/nginx_image.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       -
         name: Checkout Repo.
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
       -
         name: Login to DockerHub
         uses: docker/login-action@v1

.github/workflows/releaseWorkflow.yml

@@ -9,7 +9,7 @@ jobs:
   Create-new-Release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2
       - name: get version
         id: vars
         run: echo ::set-output name=tag::${GITHUB_REF#refs/*/} # pls dont ask me why it has to work like this.