chore(deps-dev): bump httpx from 0.27.2 to 0.28.0

Bumps [httpx](https://github.com/encode/httpx) from 0.27.2 to 0.28.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.27.2...0.28.0)

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

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

Author: dependabot[bot]

Diff for: poetry.lock

@@ -113,7 +113,7 @@ cfn-lint = "1.20.1"
 mypy = "^1.1.1"
 types-python-dateutil = "^2.8.19.6"
 aws-cdk-aws-appsync-alpha = "^2.59.0a0"
-httpx = ">=0.23.3,<0.28.0"
+httpx = ">=0.23.3,<0.29.0"
 sentry-sdk = ">=1.22.2,<3.0.0"
 ruff = ">=0.5.1,<0.8.1"
 retry2 = "^0.9.5"