BF?: ignore unclosed connection resource warning from VCR

locally (vcr 5.1.0) it causes tests to fail, possibly masking another
issue ref: #1332

Author: yarikoptic

tox.ini

@@ -66,6 +66,7 @@ filterwarnings =
     ignore:.*Value with data type .* is being converted:hdmf.build.warnings.DtypeConversionWarning
     ignore:.*find_spec\(\) not found:ImportWarning
     ignore:'cgi' is deprecated:DeprecationWarning:botocore
+    ignore:.*unclosed.*:ResourceWarning:vcr
 
 [coverage:run]
 parallel = True