fix(deps): update dependency @types/jest to v26.0.21 (#51)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@types/jest](https://togithub.com/DefinitelyTyped/DefinitelyTyped) | [`26.0.20` -> `26.0.21`](https://renovatebot.com/diffs/npm/@types%2fjest/26.0.20/26.0.21) | [![age](https://badges.renovateapi.com/packages/npm/@types%2fjest/26.0.21/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@types%2fjest/26.0.21/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@types%2fjest/26.0.21/compatibility-slim/26.0.20)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@types%2fjest/26.0.21/confidence-slim/26.0.20)](https://docs.renovatebot.com/merge-confidence/) |

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Author: kodiakhq[bot]

template/cra-subgraph/package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "@apollo/react-hooks": "4.0.0",
     "@protofire/subgraph-toolkit": "0.1.1",
-    "@types/jest": "26.0.20",
+    "@types/jest": "26.0.21",
     "@types/node": "12.20.6",
     "@types/react": "17.0.3",
     "@types/react-dom": "17.0.2",