Bump @types/jest from 26.0.15 to 26.0.20 in /desktop (#2024)

Summary:
Bumps [types/jest](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/jest) from 26.0.15 to 26.0.20.
<details>
<summary>Commits</summary>
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<li>See full diff in <a href="https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/jest">compare view</a></li>
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Pull Request resolved: https://github.com/facebook/flipper/pull/2024

Reviewed By: mweststrate

Differential Revision: D26843905

Pulled By: passy

fbshipit-source-id: b9537ff8c371ee9660943361e3eeafba23707928

desktop/flipper-plugin/package.json

@@ -15,7 +15,7 @@
     "react-element-to-jsx-string": "^14.3.2"
   },
   "devDependencies": {
-    "@types/jest": "^26.0.3",
+    "@types/jest": "^26.0.20",
     "jest-mock-console": "^1.0.1",
     "typescript": "^4.1.2"
   },

desktop/yarn.lock

@@ -2245,10 +2245,10 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@26", "@types/jest@26.x", "@types/jest@^26", "@types/jest@^26.0.3":
-  version "26.0.15"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.15.tgz#12e02c0372ad0548e07b9f4e19132b834cb1effe"
-  integrity sha512-s2VMReFXRg9XXxV+CW9e5Nz8fH2K1aEhwgjUqPPbQd7g95T0laAcvLv032EhFHIa5GHsZ8W7iJEQVaJq6k3Gog==
+"@types/jest@26", "@types/jest@26.x", "@types/jest@^26", "@types/jest@^26.0.20":
+  version "26.0.20"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.20.tgz#cd2f2702ecf69e86b586e1f5223a60e454056307"
+  integrity sha512-9zi2Y+5USJRxd0FsahERhBwlcvFh6D2GLQnY2FH2BzK8J9s9omvNHIbvABwIluXa0fD8XVKMLTO0aOEuUfACAA==
   dependencies:
     jest-diff "^26.0.0"
     pretty-format "^26.0.0"