Merge pull request #3452 from bsipocz/MAINT_py39_warning

Author: bsipocz

setup.cfg

@@ -95,6 +95,8 @@ filterwarnings =
 # CoverageWarnings triggered by one of the other plugins(?). Either case, explicitely
 # ignore it here to have passing test for pytest 8.4.
     ignore:Module astroquery was previously imported, but not measured:coverage.exceptions.CoverageWarning
+# Python 3.9 warning for the newest boto releases
+  ignore:Boto3 will no longer support Python 3.9:boto3.exceptions.PythonDeprecationWarning
 
 markers =
     bigdata: marks tests that are expected to trigger a large download (deselect with '-m "not bigdata"')