bump packaging upper-bound to <27 (#6102)

allow newer version of packaging to avoid conflict with hatchling build system
requirements

Author: masenf

pyproject.toml

@@ -24,7 +24,7 @@ dependencies = [
   "click >=8.2",
   "granian[reload] >=2.5.5",
   "httpx >=0.23.3,<1.0",
-  "packaging >=24.2,<26",
+  "packaging >=24.2,<27",
   "platformdirs >=4.3.7,<5.0",
   "psutil >=7.0.0,<8.0; sys_platform == 'win32'",
   "pydantic >=1.10.21,<3.0",