Bump vue-i18n from 8.19.0 to 8.20.0

Bumps [vue-i18n](https://github.com/kazupon/vue-i18n) from 8.19.0 to 8.20.0.
- [Release notes](https://github.com/kazupon/vue-i18n/releases)
- [Changelog](https://github.com/kazupon/vue-i18n/blob/v8.x/CHANGELOG.md)
- [Commits](https://github.com/kazupon/vue-i18n/compare/v8.19.0...v8.20.0)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -12892,9 +12892,9 @@
       }
     },
     "vue-i18n": {
-      "version": "8.19.0",
-      "resolved": "https://registry.npmjs.org/vue-i18n/-/vue-i18n-8.19.0.tgz",
-      "integrity": "sha512-jXPsvkmDMkwhjGQEDF6BgGsmJQLjIO1CXJQ1RjZRnU80kzRG+/+277ADFTulAPQSb0hUlrsp4VzEPdeO7lKcRA=="
+      "version": "8.20.0",
+      "resolved": "https://registry.npmjs.org/vue-i18n/-/vue-i18n-8.20.0.tgz",
+      "integrity": "sha512-ZiAOoeR4d/JtKpbjipx3I80ey7cYG1ki5gQ7HwzWm4YFio9brA15BEYHjalEoBaEfzF5OBEZP+Y2MvAaWnyXXg=="
     },
     "vue-loader": {
       "version": "15.9.1",

package.json

@@ -41,7 +41,7 @@
     "source-map-support": "^0.5.16",
     "spectre.css": "^0.5.9",
     "vue-click-outside": "^1.1.0",
-    "vue-i18n": "^8.19.0",
+    "vue-i18n": "^8.20.0",
     "vue-the-mask": "^0.11.1",
     "vuedraggable": "^2.24.0",
     "vuex": "^3.5.1",