Bump prettier from 2.1.2 to 2.2.0 in /src/Bicep.Cli.E2eTests (#961)

Bumps [prettier](https://github.com/prettier/prettier) from 2.1.2 to 2.2.0.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/master/CHANGELOG.md)
- [Commits](prettier/prettier@2.1.2...2.2.0)

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

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

src/Bicep.Cli.E2eTests/package.json

@@ -5,7 +5,7 @@
   "devDependencies": {
     "cross-spawn": "^7.0.3",
     "jest": "^26.6.3",
-    "prettier": "^2.1.2"
+    "prettier": "^2.2.0"
   },
   "scripts": {
     "test": "jest"