chore(deps): update dependency stylelint to v15 (#212)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Yosuke Ota <[email protected]>

Author: renovate[bot]

package.json

@@ -105,9 +105,9 @@
     "prettier": "^2.0.5",
     "raw-loader": "^4.0.1",
     "semver": "^7.3.2",
-    "stylelint": "^14.9.1",
+    "stylelint": "^15.0.0",
     "stylelint-config-recommended-vue": "^1.0.0",
-    "stylelint-config-standard": "^29.0.0",
+    "stylelint-config-standard": "^30.0.0",
     "stylelint-stylus": "^0.18.0",
     "ts-node": "^10.0.0",
     "typescript": "^4.0.0",