Update dependency httpx to v0.28.1

[bump version]

requirements-dev.txt

@@ -5,7 +5,7 @@
 pytest==8.3.4
 pytest-cov==6.0.0
 black==24.10.0
-httpx==0.28.0
+httpx==0.28.1
 pytest-testdox==3.1.0
 mock==5.1.0
 pre-commit==4.0.1