Bump httpx from 0.18.1 to 0.18.2

Bumps [httpx](https://github.com/encode/httpx) from 0.18.1 to 0.18.2.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.18.1...0.18.2)

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

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

requirements.txt

@@ -1,2 +1,2 @@
-httpx==0.18.1
+httpx==0.18.2
 requests==2.25.1