Bump httpx-oauth from 0.14.1 to 0.15.1

Bumps [httpx-oauth](https://github.com/frankie567/httpx-oauth) from 0.14.1 to 0.15.1.
- [Release notes](https://github.com/frankie567/httpx-oauth/releases)
- [Commits](frankie567/httpx-oauth@v0.14.1...v0.15.1)

---
updated-dependencies:
- dependency-name: httpx-oauth
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -18,7 +18,7 @@ fastapi-users-db-sqlalchemy==6.0.1
 fastapi-users[all]==13.0.0
 fastapi==0.115.0
 feedgen==1.0.0
-httpx-oauth==0.14.1
+httpx-oauth==0.15.1
 jinja2==3.1.4
 jmespath==1.0.1
 lxml==5.3.0