chore(deps): bump joserfc from 1.6.5 to 1.6.8 in /mcp_server

Bumps [joserfc](https://github.com/authlib/joserfc) from 1.6.5 to 1.6.8.
- [Release notes](https://github.com/authlib/joserfc/releases)
- [Changelog](https://github.com/authlib/joserfc/blob/main/docs/changelog.rst)
- [Commits](https://github.com/authlib/joserfc/compare/1.6.5...1.6.8)

---
updated-dependencies:
- dependency-name: joserfc
  dependency-version: 1.6.8
  dependency-type: indirect
...

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

mcp_server/uv.lock

@@ -481,14 +481,14 @@ wheels = [
 
 [[package]]
 name = "joserfc"
-version = "1.6.5"
+version = "1.6.8"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "cryptography" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/3b/dc/5f768c2e391e9afabe5d18e3221346deb5fb6338565f1ccc9e7c6d7befdd/joserfc-1.6.5.tar.gz", hash = "sha256:1482a7db78fb4602e44ed89e51b599d052e091288c7c532c5b694e20149dec48", size = 231881, upload-time = "2026-05-06T04:58:13.408Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/5d/ac/d4fd5b30f82900eac60d765f179f0ba005825ac462cc8ced6e13ec685ab3/joserfc-1.6.8.tar.gz", hash = "sha256:878620c553a6ebdd76ccdc356782fee3f735f21a356d079a546b42a4670ace5f", size = 232930, upload-time = "2026-05-27T03:22:37.819Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/54/3b/ad1cb22e75c963b1f07c8a2329bf47227ce7e4361df5eb2fb101b2ce33ef/joserfc-1.6.5-py3-none-any.whl", hash = "sha256:e9878a0f8243fe7b95e11fdda81374ca9f7a689e302751579d3dfdeec559675e", size = 70464, upload-time = "2026-05-06T04:58:11.668Z" },
+    { url = "https://files.pythonhosted.org/packages/98/8c/5cdce2cf3ce8155849baf9a5e2ce77e89dc87ec3bdb38259e5d85fbc45bd/joserfc-1.6.8-py3-none-any.whl", hash = "sha256:22fb31a69094a5e6f44632002a9df2c30c941fc6c8ce1b037e92c03de954cf9f", size = 70927, upload-time = "2026-05-27T03:22:35.796Z" },
 ]
 
 [[package]]