scaffolder: move @types/nunjucks to devDeps

Signed-off-by: Mike Lewis <mtlewis@users.noreply.github.com>

plugins/scaffolder-backend/package.json

@@ -40,7 +40,6 @@
     "@octokit/rest": "^18.5.3",
     "@types/express": "^4.17.6",
     "@types/git-url-parse": "^9.0.0",
-    "@types/nunjucks": "^3.1.4",
     "azure-devops-node-api": "^10.1.1",
     "command-exists": "^1.2.9",
     "compression": "^1.7.4",
@@ -71,6 +70,7 @@
     "@types/command-exists": "^1.2.0",
     "@types/fs-extra": "^9.0.1",
     "@types/mock-fs": "^4.13.0",
+    "@types/nunjucks": "^3.1.4",
     "@types/supertest": "^2.0.8",
     "jest-when": "^3.1.0",
     "mock-fs": "^4.13.0",