Update checkout actions, add dependabot (#695)

Author: kevmoo

.github/dependabot.yml

@@ -0,0 +1,9 @@
+# Dependabot configuration file.
+# See https://docs.github.com/en/code-security/dependabot/dependabot-version-updates
+version: 2
+
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/adaptive_banner_example.yaml

@@ -33,7 +33,7 @@ jobs:
     if: github.event_name == 'pull_request'
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"
@@ -47,7 +47,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"
@@ -64,7 +64,7 @@ jobs:
     if: github.event_name == 'pull_request'
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"

.github/workflows/app_open_example.yaml

@@ -33,7 +33,7 @@ jobs:
     if: github.event_name == 'pull_request'
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"
@@ -47,7 +47,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"
@@ -64,7 +64,7 @@ jobs:
     if: github.event_name == 'pull_request'
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"

.github/workflows/interstitial_example.yaml

@@ -33,7 +33,7 @@ jobs:
     if: github.event_name == 'pull_request'
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"
@@ -47,7 +47,7 @@ jobs:
     runs-on: macos-latest
     timeout-minutes: 40
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"
@@ -64,7 +64,7 @@ jobs:
     if: github.event_name == 'pull_request'
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
         with:
           fetch-depth: 0
       - name: "Install Flutter"