Update jest2 in group main to the latest version � (#1115)

Summary:
***
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## There have been updates to the *jest2* monorepo:

- The `devDependency` [pretty-format](https://github.com/facebook/jest) was updated from `25.5.0` to `26.0.0`.

These versions are **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

This monorepo update includes releases of one or more dependencies which all belong to the [jest2 group definition](https://github.com/greenkeeperio/monorepo-definitions).

 ---

**Publisher:** [simenb](https://www.npmjs.com/~simenb)
**License:** MIT

[Find out more about this release](https://github.com/facebook/jest).

 ---

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/1115

Reviewed By: mweststrate

Differential Revision: D21399338

Pulled By: passy

fbshipit-source-id: 659471aebc316056c5cc7bdeae91b18f1c6c5ba3

desktop/package.json

@@ -193,7 +193,7 @@
     "p-map": "^4.0.0",
     "pkg": "^4.4.1",
     "prettier": "^2.0.0",
-    "pretty-format": "^25.4.0",
+    "pretty-format": "^26.0.0",
     "promisify-child-process": "^3.1.3",
     "react-async": "^10.0.0",
     "react-refresh": "^0.8.1",

desktop/yarn.lock

@@ -1595,6 +1595,16 @@
     "@types/yargs" "^15.0.0"
     chalk "^3.0.0"
 
+"@jest/types@^26.0.1":
+  version "26.0.1"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.0.1.tgz#b78333fbd113fa7aec8d39de24f88de8686dac67"
+  integrity sha512-IbtjvqI9+eS1qFnOIEL7ggWmT+iK/U+Vde9cGWtYb/b6XgKb3X44ZAe/z9YZzoAAZ/E92m0DqrilF934IGNnQA==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^1.1.1"
+    "@types/yargs" "^15.0.0"
+    chalk "^4.0.0"
+
 "@nodelib/fs.scandir@2.1.3":
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.scandir/-/fs.scandir-2.1.3.tgz#3a582bdb53804c6ba6d146579c46e52130cf4a3b"
@@ -3569,6 +3579,14 @@ chalk@^3.0.0:
     ansi-styles "^4.1.0"
     supports-color "^7.1.0"
 
+chalk@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.0.0.tgz#6e98081ed2d17faab615eb52ac66ec1fe6209e72"
+  integrity sha512-N9oWFcegS0sFr9oh1oz2d7Npos6vNoWW9HvtCg5N1KRFpUhaAhvTv5Y58g880fZaEYSNm3qDz8SU1UrGvp+n7A==
+  dependencies:
+    ansi-styles "^4.1.0"
+    supports-color "^7.1.0"
+
 character-entities-legacy@^1.0.0:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/character-entities-legacy/-/character-entities-legacy-1.1.4.tgz#94bc1845dce70a5bb9d2ecc748725661293d8fc1"
@@ -9946,6 +9964,16 @@ pretty-format@^25.5.0:
     ansi-styles "^4.0.0"
     react-is "^16.12.0"
 
+pretty-format@^26.0.0:
+  version "26.0.1"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.0.1.tgz#a4fe54fe428ad2fd3413ca6bbd1ec8c2e277e197"
+  integrity sha512-SWxz6MbupT3ZSlL0Po4WF/KujhQaVehijR2blyRDCzk9e45EaYMVhMBn49fnRuHxtkSpXTes1GxNpVmH86Bxfw==
+  dependencies:
+    "@jest/types" "^26.0.1"
+    ansi-regex "^5.0.0"
+    ansi-styles "^4.0.0"
+    react-is "^16.12.0"
+
 private@^0.1.8, private@~0.1.5:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"