Bump hono from 4.12.18 to 4.12.21 (#44)

Bumps [hono](https://github.com/honojs/hono) from 4.12.18 to 4.12.21.
- [Release notes](https://github.com/honojs/hono/releases)
- [Commits](honojs/hono@v4.12.18...v4.12.21)

---
updated-dependencies:
- dependency-name: hono
  dependency-version: 4.12.19
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -22,7 +22,7 @@
     "@devvit/web": "0.12.24",
     "@hono/node-server": "2.0.2",
     "devvit": "0.12.24",
-    "hono": "4.12.18",
+    "hono": "4.12.21",
     "react": "19.2.6",
     "react-dom": "19.2.6"
   },