update actions (#188)

Author: kimxogus

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      # Check for updates to GitHub Actions every week
+      interval: 'weekly'

.github/workflows/lint.yml

@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node-version: [12.x]
+        node-version: [18.x]
     steps:
       - uses: actions/checkout@v2
       - name: Setup node ${{ matrix.node-version }} in ${{ runner.OS }}

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [14.x, 16.x, 18.x]
     steps:
       - uses: actions/checkout@v2
       - name: Setup node ${{ matrix.node-version }} in ${{ runner.OS }}