Bump sourcecred from 0.7.0-beta-14 to 0.7.4 (#226)

Bumps [sourcecred](https://github.com/sourcecred/sourcecred) from 0.7.0-beta-14 to 0.7.4.
- [Release notes](https://github.com/sourcecred/sourcecred/releases)
- [Changelog](https://github.com/sourcecred/sourcecred/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sourcecred/sourcecred/compare/v0.7.0-beta-14...v0.7.4)

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

packages/backend/package.json

@@ -30,7 +30,7 @@
     "imgix-core-js": "^2.3.1",
     "node-fetch": "^2.6.0",
     "graphql-request": "^3.0.0-next.4",
-    "sourcecred": "0.7.0-beta-14"
+    "sourcecred": "0.7.4"
   },
   "devDependencies": {
     "@types/express": "^4.17.6",