irrelevant warning in sc.readwrite.is_valid_filename

[nicolasrochette]

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scanpy/src/scanpy/readwrite.py

Lines 1159 to 1164 in c4cbb22

	if len(ext_from_file) > 2:
	logg.warning(
	f"Your filename has more than two extensions: {ext_from_file}.\n"
	f"Only considering the two last: {ext_from_file[-2:]}."
	)
	ext_from_file = ext_from_file[-2:]

As long as the extension can be parsed without issues, a warning does not seem justified.

Proposed change: remove the warning so as to execute silently upon successful parsing of the extension

Related: #2288