chore(deps): update nunjucks to 3.2.3

Fixes a prototype pollution in nunjucks. See
<mozilla/nunjucks#1331> for more
information.

Author: striezel

package-lock.json

@@ -38,7 +38,7 @@
         "@actions/core": "^1.2.4",
         "@actions/github": "^2.1.1",
         "npm-check-updates": "^4.1.2",
-        "nunjucks": "^3.2.1"
+        "nunjucks": "^3.2.3"
     },
     "devDependencies": {
         "@typescript-eslint/eslint-plugin": "^2.31.0",