Remove pytest upper bound pin (rapidsai#1867)

## Summary

Refs rapidsai/build-planning#230

Removes the pytest `<9` upper bound pin. The pin was added as a workaround for a compatibility issue with pytest 9, which was resolved at the time of pytest 9's release (see rapidsai/cudf#20570 (comment)). Removing the pin allows pytest 9 to be used.

Changes:
- Update `dependencies.yaml`: remove the `<9.0.0` upper bound from `pytest`, leaving it as an unpinned dependency
- Regenerate all derived files via `rapids-dependency-file-generator`

Authors:
  - Vyas Ramasubramani (https://github.com/vyasr)

Approvers:
  - Kyle Edwards (https://github.com/KyleFromNVIDIA)
  - James Lamb (https://github.com/jameslamb)

URL: rapidsai#1867

Author: vyasr

conda/environments/all_cuda-129_arch-aarch64.yaml

@@ -40,8 +40,8 @@ dependencies:
 - openblas
 - pre-commit
 - pylibraft==26.4.*,>=0.0.0a0
+- pytest
 - pytest-cov
-- pytest<9.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - recommonmark
 - rust

conda/environments/all_cuda-129_arch-x86_64.yaml

@@ -40,8 +40,8 @@ dependencies:
 - openblas
 - pre-commit
 - pylibraft==26.4.*,>=0.0.0a0
+- pytest
 - pytest-cov
-- pytest<9.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - recommonmark
 - rust

conda/environments/all_cuda-131_arch-aarch64.yaml

@@ -41,8 +41,8 @@ dependencies:
 - openblas
 - pre-commit
 - pylibraft==26.4.*,>=0.0.0a0
+- pytest
 - pytest-cov
-- pytest<9.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - recommonmark
 - rust

conda/environments/all_cuda-131_arch-x86_64.yaml

@@ -41,8 +41,8 @@ dependencies:
 - openblas
 - pre-commit
 - pylibraft==26.4.*,>=0.0.0a0
+- pytest
 - pytest-cov
-- pytest<9.0.0
 - rapids-build-backend>=0.4.0,<0.5.0
 - recommonmark
 - rust

dependencies.yaml

@@ -382,7 +382,7 @@ dependencies:
         packages:
           - *cmake_ver
           - openblas
-          - &pytest pytest<9.0.0
+          - &pytest pytest
   docs:
     common:
       - output_types: [conda]

python/cuvs/pyproject.toml

@@ -37,8 +37,8 @@ classifiers = [
 [project.optional-dependencies]
 test = [
     "cupy-cuda13x>=13.6.0",
+    "pytest",
     "pytest-cov",
-    "pytest<9.0.0",
     "scikit-learn>=1.5",
 ] # This list was generated by `rapids-dependency-file-generator`. To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.