chore: drop Node v12 support because of the EOL (#77)

* ci: update `actions/checkout` v2.3.1->v3.0.2

* ci: update `actions/setup-node` v2.0.0->v3.4.1

* ci: update node version to v12

* chore: drop Node v12 support

.github/workflows/lint.yml

@@ -4,14 +4,14 @@ on: [push]
 
 jobs:
   build:
-    name: Node.js ubuntu-latest 12.x
+    name: Node.js ubuntu-latest 14.x
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.1
+      - uses: actions/checkout@v3.0.2
       - name: Setup node
-        uses: actions/setup-node@v2.0.0
+        uses: actions/setup-node@v3.4.1
         with:
-          node-version: 12.x
+          node-version: 14.x
       - run: |
           npm ci
           npm run lint

.github/workflows/shipjs-manual-prepare.yml

@@ -10,13 +10,13 @@ jobs:
       startsWith(github.event.comment.body, '@shipjs prepare')
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.3.1
+      - uses: actions/checkout@v3.0.2
         with:
           fetch-depth: 0
           ref: master
-      - uses: actions/setup-node@v2.0.0
+      - uses: actions/setup-node@v3.4.1
         with:
-          node-version: 12.x
+          node-version: 14.x
       - run: |
           if [ -f "yarn.lock" ]; then
             yarn install

.github/workflows/shipjs-trigger.yml

@@ -9,13 +9,13 @@ jobs:
     runs-on: ubuntu-latest
     if: github.event.pull_request.merged == true && startsWith(github.head_ref, 'releases/v')
     steps:
-      - uses: actions/checkout@v2.3.1
+      - uses: actions/checkout@v3.0.2
         with:
           fetch-depth: 0
           ref: master
-      - uses: actions/setup-node@v2.0.0
+      - uses: actions/setup-node@v3.4.1
         with:
-          node-version: 12.x
+          node-version: 14.x
           registry-url: "https://registry.npmjs.org"
       - run: |
           if [ -f "yarn.lock" ]; then

.github/workflows/test.yml

@@ -7,13 +7,13 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        node-version: [10.x, 12.x]
+        node-version: [14.x, 16.x]
     name: Node.js ${{ matrix.os }} ${{ matrix.node-version }}
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v2.3.1
+      - uses: actions/checkout@v3.0.2
       - name: Setup node
-        uses: actions/setup-node@v2.0.0
+        uses: actions/setup-node@v3.4.1
         with:
           node-version: ${{ matrix.node-version }}
       - run: |

package.json

@@ -55,7 +55,7 @@
   },
   "homepage": "https://github.com/miyajan/garoon-rest",
   "engines": {
-    "node": ">=10.0.0"
+    "node": ">=14.0.0"
   },
   "devDependencies": {
     "@babel/preset-env": "^7.10.3",