Bump @types/node from 15.9.0 to 15.12.1 in /dashboard (#2942)

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 15.9.0 to 15.12.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

dashboard/package.json

@@ -116,7 +116,7 @@
     "@types/enzyme": "^3.10.8",
     "@types/enzyme-adapter-react-16": "^1.0.6",
     "@types/jest": "^26.0.23",
-    "@types/node": "^15.9.0",
+    "@types/node": "^15.12.1",
     "@types/react-dom": "^17.0.6",
     "@types/react-helmet": "^6.1.1",
     "@types/react-redux": "^7.1.16",

dashboard/yarn.lock

@@ -2190,10 +2190,10 @@
   dependencies:
     axios "^0.21.1"
 
-"@types/node@*", "@types/node@>=13.7.0", "@types/node@^15.9.0":
-  version "15.9.0"
-  resolved "https://registry.yarnpkg.com/@types/node/-/node-15.9.0.tgz#0b7f6c33ca5618fe329a9d832b478b4964d325a8"
-  integrity sha512-AR1Vq1Ei1GaA5FjKL5PBqblTZsL5M+monvGSZwe6sSIdGiuu7Xr/pNwWJY+0ZQuN8AapD/XMB5IzBAyYRFbocA==
+"@types/node@*", "@types/node@>=13.7.0", "@types/node@^15.12.1":
+  version "15.12.1"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-15.12.1.tgz#9b60797dee1895383a725f828a869c86c6caa5c2"
+  integrity sha512-zyxJM8I1c9q5sRMtVF+zdd13Jt6RU4r4qfhTd7lQubyThvLfx6yYekWSQjGCGV2Tkecgxnlpl/DNlb6Hg+dmEw==
 
 "@types/node@14":
   version "14.14.43"