Bump superagent from 6.1.0 to 8.1.2

Bumps [superagent](https://github.com/ladjs/superagent) from 6.1.0 to 8.1.2.
- [Release notes](https://github.com/ladjs/superagent/releases)
- [Changelog](https://github.com/ladjs/superagent/blob/master/HISTORY.md)
- [Commits](https://github.com/ladjs/superagent/compare/v6.1.0...v8.1.2)

---
updated-dependencies:
- dependency-name: superagent
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -112,7 +112,7 @@
     "react-frame-component": "^4.1.3",
     "react-router-dom": "6.16.0",
     "sanitize-filename": "1.6.3",
-    "superagent": "^6.1.0",
+    "superagent": "^8.1.2",
     "vitreum": "git+https://git@github.com/calculuschild/vitreum.git"
   },
   "devDependencies": {