[stubsabot] Bump Authlib to 1.6.8

Release: https://pypi.org/pypi/Authlib/1.6.8
Repository: https://github.com/authlib/authlib
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/Authlib
Diff: authlib/authlib@v1.6.7...v1.6.8

Stubsabot analysis of the diff between the two releases:
 - 0 public Python files have been added.
 - 0 files included in typeshed's stubs have been deleted.
 - 2 files included in typeshed's stubs have been modified or renamed: `authlib/consts.py`, `authlib/jose/__init__.py`.
 - Total lines of Python code added: 2.
 - Total lines of Python code deleted: 1.

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- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

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Author: stubsabot

stubs/Authlib/METADATA.toml

@@ -1,3 +1,3 @@
-version = "1.6.7"
+version = "1.6.8"
 upstream_repository = "https://github.com/authlib/authlib"
 requires = ["cryptography"]