Chore: Upgrade Jest to latest (#25591)

* Chore: Upgrade Jest to latest

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

* Chore: reduces strict null errors

Co-authored-by: Hugo Häggmark <hugo.haggmark@grafana.com>

package.json

@@ -83,7 +83,7 @@
     "@types/file-saver": "2.0.1",
     "@types/hoist-non-react-statics": "3.3.0",
     "@types/is-hotkey": "0.1.1",
-    "@types/jest": "24.0.13",
+    "@types/jest": "26.0.0",
     "@types/jquery": "3.3.32",
     "@types/lodash": "4.14.149",
     "@types/lru-cache": "^5.1.0",
@@ -116,7 +116,7 @@
     "autoprefixer": "9.7.4",
     "axios": "0.19.2",
     "babel-core": "7.0.0-bridge.0",
-    "babel-jest": "24.8.0",
+    "babel-jest": "26.0.1",
     "babel-loader": "8.0.6",
     "babel-plugin-angularjs-annotate": "0.10.0",
     "clean-webpack-plugin": "3.0.0",
@@ -156,9 +156,9 @@
     "html-webpack-harddisk-plugin": "1.0.1",
     "html-webpack-plugin": "3.2.0",
     "husky": "4.2.1",
-    "jest": "24.8.0",
-    "jest-canvas-mock": "2.1.2",
-    "jest-date-mock": "1.0.7",
+    "jest": "26.0.0",
+    "jest-canvas-mock": "2.2.0",
+    "jest-date-mock": "1.0.8",
     "lerna": "^3.20.2",
     "lint-staged": "10.0.7",
     "load-grunt-tasks": "5.1.0",
@@ -185,7 +185,7 @@
     "sinon": "8.1.1",
     "style-loader": "1.1.3",
     "terser-webpack-plugin": "2.3.5",
-    "ts-jest": "24.1.0",
+    "ts-jest": "26.1.0",
     "ts-node": "8.8.1",
     "tslib": "1.10.0",
     "typescript": "3.7.5",