increment jest version for consistency

Author: maxsbelt

packages/react-dev-utils/package.json

@@ -79,7 +79,7 @@
   },
   "devDependencies": {
     "cross-env": "^7.0.2",
-    "jest": "26.4.2"
+    "jest": "26.6.0"
   },
   "scripts": {
     "test": "cross-env FORCE_COLOR=true jest"

packages/react-scripts/fixtures/kitchensink/template.json

@@ -2,7 +2,7 @@
   "package": {
     "dependencies": {
       "bootstrap": "4.3.1",
-      "jest": "26.4.2",
+      "jest": "26.6.0",
       "node-sass": "4.x",
       "normalize.css": "7.0.0",
       "prop-types": "15.7.2",