Update dependency mocha to v9 (#19)

* Update dependency mocha to v9

* Update ci.yml

* Update ci.yml

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

Author: 3 people

.github/workflows/ci.yml

@@ -80,7 +80,7 @@ jobs:
             npm r -D vuepress eslint-plugin-eslint-plugin eslint-plugin-prettier vue-eslint-parser eslint-plugin-vue
       - name: Install for Node v8
         run: |+
-            npm i -D @typescript-eslint/parser@3
+            npm i -D @typescript-eslint/parser@3 mocha@7
         if: "matrix.node == '8.10'"
       - name: Install for ESLint v4
         run: |+

package.json

@@ -30,7 +30,7 @@
     "eslint4b": "^7.10.0",
     "espree": "^9.3.1",
     "globals": "^13.0.0",
-    "mocha": "^6.2.0",
+    "mocha": "^9.0.0",
     "npm-run-all": "^4.1.5",
     "nyc": "^14.1.1",
     "opener": "^1.5.1",