Upgrade required packages in plugin

Signed-off-by: Erik Engervall <erik.engervall@gmail.com>

plugins/github-release-manager/package.json

@@ -20,7 +20,7 @@
     "clean": "backstage-cli clean"
   },
   "dependencies": {
-    "@backstage/core": "^0.7.3",
+    "@backstage/core": "^0.7.4",
     "@backstage/integration": "^0.5.1",
     "@backstage/theme": "^0.2.5",
     "@material-ui/core": "^4.11.0",
@@ -34,9 +34,9 @@
     "react": "^16.13.1"
   },
   "devDependencies": {
-    "@backstage/cli": "^0.6.6",
+    "@backstage/cli": "^0.6.7",
     "@backstage/dev-utils": "^0.1.13",
-    "@backstage/test-utils": "^0.1.9",
+    "@backstage/test-utils": "^0.1.10",
     "@testing-library/jest-dom": "^5.10.1",
     "@testing-library/react": "^11.2.5",
     "@testing-library/user-event": "^12.0.7",