Bump hono from 4.12.18 to 4.12.21

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

---
updated-dependencies:
- dependency-name: hono
  dependency-version: 4.12.21
  dependency-type: direct:production
...

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

package-lock.json

@@ -8865,9 +8865,9 @@
       }
     },
     "node_modules/hono": {
-      "version": "4.12.18",
-      "resolved": "https://registry.npmjs.org/hono/-/hono-4.12.18.tgz",
-      "integrity": "sha512-RWzP96k/yv0PQfyXnWjs6zot20TqfpfsNXhOnev8d1InAxubW93L11/oNUc3tQqn2G0bSdAOBpX+2uDFHV7kdQ==",
+      "version": "4.12.21",
+      "resolved": "https://registry.npmjs.org/hono/-/hono-4.12.21.tgz",
+      "integrity": "sha512-uV63apnb0kyPtAUwoWgaGh9HyIFcv8lgmzPZSiTBQAFOFGIzka5EZ1dZocmGnn0XdX0+XTqJ6Tqv7selMuGLRQ==",
       "license": "MIT",
       "engines": {
         "node": ">=16.9.0"
@@ -17076,7 +17076,7 @@
         "@hono/mcp": "^0.2.3",
         "@hono/node-server": "^1.19.13",
         "@modelcontextprotocol/sdk": "^1.26.0",
-        "hono": "^4.12.14",
+        "hono": "^4.12.21",
         "zod": "^3.25.76"
       },
       "devDependencies": {