fix(deps): update jest peer dependency to accept v27 (#59)

Also update our own tests to use v27

Author: renovate[bot]

package.json

@@ -28,7 +28,7 @@
     "ansi-escapes": "^4.3.1",
     "chalk": "^4.0.0",
     "jest-regex-util": "^26.0.0",
-    "jest-watcher": "^26.3.0",
+    "jest-watcher": "^27.0.0",
     "slash": "^3.0.0",
     "string-length": "^4.0.1",
     "strip-ansi": "^6.0.0"
@@ -44,20 +44,20 @@
     "@typescript-eslint/eslint-plugin": "^4.0.1",
     "@typescript-eslint/parser": "^4.0.1",
     "babel-eslint": "^10.1.0",
-    "babel-jest": "^26.0.0",
+    "babel-jest": "^27.0.0",
     "eslint": "^7.8.1",
     "eslint-config-airbnb-base": "^14.1.0",
     "eslint-config-prettier": "^8.0.0",
     "eslint-plugin-import": "^2.20.2",
     "eslint-plugin-jest": "^24.0.0",
     "eslint-plugin-prettier": "^3.1.3",
-    "jest": "^26.0.0",
+    "jest": "^27.0.0",
     "prettier": "^2.1.1",
     "rimraf": "^3.0.2",
     "typescript": "^4.0.2"
   },
   "peerDependencies": {
-    "jest": "^26.0.0"
+    "jest": "^26.0.0 || ^27.0.0"
   },
   "jest": {
     "watchPlugins": [