Update actions/checkout action to v3 (#135)

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -13,7 +13,7 @@ jobs:
       CONFTEST_VERSION: "0.15.0"
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           submodules: recursive
       - name: Conftest Install
@@ -46,7 +46,7 @@ jobs:
       HELM_RELEASE_BRANCH: gh-pages
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           submodules: recursive
 
@@ -65,7 +65,7 @@ jobs:
           ls -la ${HELM_TMP_DIR}
 
       # Publish
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           ref: gh-pages
           path: ./gh-pages

.github/workflows/pullrequest.yaml

@@ -10,7 +10,7 @@ jobs:
       CONFTEST_VERSION: "0.15.0"
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           submodules: recursive
       - name: Conftest Install

.github/workflows/tagging.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         submodules: recursive
         fetch-depth: 0