ci: Update tox and handle generic classifiers (#5306)

huey has moved from version-specific classifiers like "Programming
Language :: Python :: 3.13" to just "Programming Language :: Python ::
3". We use specific classifiers to figure out the concrete Python
versions the package supports, and ignore the global ones, which made
toxgen report that the latest huey release had no supported Python
versions.

Changing this so that if there are no specific classifiers and no
`requires_python`, we also check for the global "Programming Language ::
Python :: 3" classifier and assume the package supports all Python 3
versions in that case. In case that's not true, we fine-tune the Python
versions to use via the config.

Author: sentrivana

scripts/populate_tox/config.py

@@ -311,6 +311,9 @@
         "deps": {
             "*": ["mockupdb"],
         },
+        "python": {
+            "<3.6": "<3.7",
+        },
     },
     "pyramid": {
         "package": "pyramid",
@@ -368,6 +371,9 @@
             ">=0.9,<0.14": ["fakeredis>=1.0,<1.7.4"],
             "py3.6,py3.7": ["fakeredis!=2.26.0"],
         },
+        "python": {
+            "<0.13": "<3.7",
+        },
     },
     "sanic": {
         "package": "sanic",
@@ -385,6 +391,9 @@
     },
     "sqlalchemy": {
         "package": "sqlalchemy",
+        "python": {
+            "<1.4": "<3.10",
+        },
     },
     "starlette": {
         "package": "starlette",

scripts/populate_tox/package_dependencies.jsonl

@@ -504,6 +504,9 @@ def pick_python_versions_to_test(
     - a free-threaded wheel is distributed; and
     - the SDK supports free-threading.
     """
+    if not python_versions:
+        return []
+
     filtered_python_versions = {
         python_versions[0],
     }
@@ -545,7 +548,8 @@ def _parse_python_versions_from_classifiers(classifiers: list[str]) -> list[Vers
 
     if python_versions:
         python_versions.sort()
-        return python_versions
+
+    return python_versions
 
 
 def determine_python_versions(pypi_data: dict) -> Union[SpecifierSet, list[Version]]:
@@ -579,6 +583,14 @@ def determine_python_versions(pypi_data: dict) -> Union[SpecifierSet, list[Versi
     if requires_python:
         return SpecifierSet(requires_python)
 
+    # If we haven't found neither specific 3.x classifiers nor a requires_python,
+    # check if there is a generic "Python 3" classifier and if so, assume the
+    # package supports all Python versions the SDK does. If this is not the case
+    # in reality, add the actual constraints manually to config.py.
+    for classifier in classifiers:
+        if CLASSIFIER_PREFIX + "3" in classifiers:
+            return SpecifierSet(f">={MIN_PYTHON_VERSION}")
+
     return []
 
 

scripts/populate_tox/populate_tox.py

@@ -149,6 +149,7 @@ def iter_default_integrations(
     "openai_agents": (0, 0, 19),
     "openfeature": (0, 7, 1),
     "pydantic_ai": (1, 0, 0),
+    "pymongo": (3, 5, 0),
     "quart": (0, 16, 0),
     "ray": (2, 7, 0),
     "requests": (2, 0, 0),