Python: Bump pytest from 9.0.3 to 9.1.0 across /python workspace (#6524)

* Bump pytest from 9.0.3 to 9.1.0 in /python

Bumps [pytest](https://github.com/pytest-dev/pytest) from 9.0.3 to 9.1.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@9.0.3...9.1.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-version: 9.1.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

* Fix Python workspace pytest pin mismatch

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Author: dependabot[bot]

python/packages/ag-ui/pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "pytest==9.0.3",
+    "pytest==9.1.0",
     "httpx==0.28.1",
 ]
 

python/packages/devui/pyproject.toml

@@ -32,12 +32,12 @@ classifiers = [
 
 [project.optional-dependencies]
 dev = [
-    "pytest==9.0.3",
+    "pytest==9.1.0",
     "watchdog==6.0.0",
     "agent-framework-orchestrations==1.0.0rc1",
 ]
 all = [
-    "pytest==9.0.3",
+    "pytest==9.1.0",
     "watchdog==6.0.0",
 ]
 

python/packages/lab/pyproject.toml

@@ -59,7 +59,7 @@ math = [
 dev = [
     "uv==0.11.17",
     "ruff==0.15.15",
-    "pytest==9.0.3",
+    "pytest==9.1.0",
     "mypy==1.20.0",
     "pyright==1.1.408",
     #tasks

python/pyproject.toml

@@ -31,7 +31,7 @@ dev = [
     "uv==0.11.17",
     "flit==3.12.0",
     "ruff==0.15.15",
-    "pytest==9.0.3",
+    "pytest==9.1.0",
     "pytest-asyncio==1.4.0",
     "pytest-cov==7.1.0",
     "pytest-xdist[psutil]==3.8.0",