fix: bump @babel/runtime from 7.14.0 to 7.15.4 (#496)

Bumps [@babel/runtime](https://github.com/babel/babel/tree/HEAD/packages/babel-runtime) from 7.14.0 to 7.15.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.15.4/packages/babel-runtime)

---
updated-dependencies:
- dependency-name: "@babel/runtime"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -30,7 +30,7 @@
     "gatsby-plugin"
   ],
   "dependencies": {
-    "@babel/runtime": "^7.14.0",
+    "@babel/runtime": "^7.15.4",
     "generate-robotstxt": "^8.0.3"
   },
   "devDependencies": {

yarn.lock

@@ -1071,10 +1071,10 @@
     "@babel/types" "^7.4.4"
     esutils "^2.0.2"
 
-"@babel/runtime@^7.14.0", "@babel/runtime@^7.8.4":
-  version "7.14.0"
-  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.14.0.tgz#46794bc20b612c5f75e62dd071e24dfd95f1cbe6"
-  integrity sha512-JELkvo/DlpNdJ7dlyw/eY7E0suy5i5GQH+Vlxaq1nsNJ+H7f4Vtv3jMeCEgRhZZQFXTjldYfQgv2qmM6M1v5wA==
+"@babel/runtime@^7.15.4", "@babel/runtime@^7.8.4":
+  version "7.15.4"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.15.4.tgz#fd17d16bfdf878e6dd02d19753a39fa8a8d9c84a"
+  integrity sha512-99catp6bHCaxr4sJ/DbTGgHS4+Rs2RVd2g7iOap6SLGPDknRK9ztKNsE/Fg6QhSeh1FGE5f6gHGQmvvn3I3xhw==
   dependencies:
     regenerator-runtime "^0.13.4"