fix(tests): use a fixture for requests version

tests/conftest.py

@@ -0,0 +1,8 @@
+import importlib.metadata
+
+import pytest
+
+
+@pytest.fixture
+def requests_version() -> str:
+    return importlib.metadata.version("requests")

tests/test_main.py

@@ -20,15 +20,15 @@ def test_main_fails(runner: CliRunner) -> None:
 
 
 def test_retrieve_called_with_auth_headers(
-    request: pytest.FixtureRequest, runner: CliRunner
+    request: pytest.FixtureRequest, runner: CliRunner, requests_version: str
 ) -> None:
     if request.config.getoption("typeguard_packages"):
         pytest.skip(
             "The import hook that typeguard uses seems to break the mock below."
         )
 
     expected_headers = {
-        "User-Agent": "python-requests/2.32.3",
+        "User-Agent": f"python-requests/{requests_version}",
         "Accept-Encoding": "gzip, deflate",
         "Accept": "*/*",
         "Connection": "keep-alive",

tests/test_validations.py

@@ -45,9 +45,9 @@ def sample_item() -> Generator[pystac.Item, None, None]:
 
 
 @pytest.fixture
-def expected_headers() -> Generator[Dict[str, str], None, None]:
+def expected_headers(requests_version: str) -> Generator[Dict[str, str], None, None]:
     yield {
-        "User-Agent": "python-requests/2.32.3",
+        "User-Agent": f"python-requests/{requests_version}",
         "Accept-Encoding": "gzip, deflate",
         "Accept": "*/*",
         "Connection": "keep-alive",