Pin to pytest 7. (rapidsai#2137)

There is an unusual test failure in raft-dask:

```
Exception: ModuleNotFoundError("No module named 'raft_dask.common.comms_utils'")
```

The tests started failing at the same time that pytest 8 was released. This PR tests with `pytest==7.*` to isolate the root cause (and fix it if it is the problem).

conda/environments/all_cuda-118_arch-aarch64.yaml

@@ -44,8 +44,8 @@ dependencies:
 - nvcc_linux-aarch64=11.8
 - pre-commit
 - pydata-sphinx-theme
-- pytest
 - pytest-cov
+- pytest==7.*
 - rapids-dask-dependency==24.2.*
 - recommonmark
 - rmm==24.2.*

conda/environments/all_cuda-118_arch-x86_64.yaml

@@ -44,8 +44,8 @@ dependencies:
 - nvcc_linux-64=11.8
 - pre-commit
 - pydata-sphinx-theme
-- pytest
 - pytest-cov
+- pytest==7.*
 - rapids-dask-dependency==24.2.*
 - recommonmark
 - rmm==24.2.*

conda/environments/all_cuda-120_arch-aarch64.yaml

@@ -40,8 +40,8 @@ dependencies:
 - numpydoc
 - pre-commit
 - pydata-sphinx-theme
-- pytest
 - pytest-cov
+- pytest==7.*
 - rapids-dask-dependency==24.2.*
 - recommonmark
 - rmm==24.2.*

conda/environments/all_cuda-120_arch-x86_64.yaml

@@ -40,8 +40,8 @@ dependencies:
 - numpydoc
 - pre-commit
 - pydata-sphinx-theme
-- pytest
 - pytest-cov
+- pytest==7.*
 - rapids-dask-dependency==24.2.*
 - recommonmark
 - rmm==24.2.*

dependencies.yaml

@@ -500,7 +500,7 @@ dependencies:
     common:
       - output_types: [conda, requirements, pyproject]
         packages:
-          - pytest
+          - pytest==7.*
           - pytest-cov
   test_pylibraft:
     common:

python/pylibraft/pyproject.toml

@@ -49,8 +49,8 @@ classifiers = [
 [project.optional-dependencies]
 test = [
     "cupy-cuda11x>=12.0.0",
-    "pytest",
     "pytest-cov",
+    "pytest==7.*",
     "scikit-learn",
     "scipy",
 ] # This list was generated by `rapids-dependency-file-generator`. To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.

python/raft-dask/pyproject.toml

@@ -50,8 +50,8 @@ classifiers = [
 
 [project.optional-dependencies]
 test = [
-    "pytest",
     "pytest-cov",
+    "pytest==7.*",
 ] # This list was generated by `rapids-dependency-file-generator`. To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.
 
 [project.urls]