Bump @vercel/ncc from 0.28.3 to 0.28.4

Bumps [@vercel/ncc](https://github.com/vercel/ncc) from 0.28.3 to 0.28.4.
- [Release notes](https://github.com/vercel/ncc/releases)
- [Commits](https://github.com/vercel/ncc/compare/0.28.3...0.28.4)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -206,9 +206,9 @@
       "integrity": "sha512-jiE3QIxJ8JLNcb1Ps6rDbysDhN4xa8DJJvuC9prr6w+1tIh+QAbYyNF3tyiZNLDBIuBCf4KEcV2UvQm/V60xfA=="
     },
     "@vercel/ncc": {
-      "version": "0.28.3",
-      "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.28.3.tgz",
-      "integrity": "sha512-g3gk4D9itbhUQa5MtN7TOdeoQnNLkPDCox5SBaQ/H3Or5lo59TOaZWrLb+x47StiAJ+8DXZS/9MJ67cIBWSsRw=="
+      "version": "0.28.4",
+      "resolved": "https://registry.npmjs.org/@vercel/ncc/-/ncc-0.28.4.tgz",
+      "integrity": "sha512-vQe8WuBMiBgJbRM9TXMSb2zXmaoplH84K91nd2CmIlrXH0F3RjyiO9kdvaZbKbAQ66Mh/hMF2JPtDzbVvsx+Eg=="
     },
     "acorn": {
       "version": "7.4.1",

package.json

@@ -19,7 +19,7 @@
   "dependencies": {
     "@actions/core": "^1.2.7",
     "@actions/github": "^4.0.0",
-    "@vercel/ncc": "^0.28.3",
+    "@vercel/ncc": "^0.28.4",
     "markdown-it": "^12.0.6",
     "matrix-js-sdk": "^10.0.0"
   },