Revert "Remove chardet version upper limit"

This reverts commit 0f27cd5.

Original change sounded kosher and "we agreed" with reasoning but original PR
datalad#7029 for some reason did not have
Travis CI runs and now after it was merged we keep getting tests failed when
submitting PRs against maint with failures like

	____________________________ test_run_datalad_help _____________________________
	[gw0] linux -- Python 3.8.6 /tmp/dl-miniconda-jm48jjoo/bin/python

		@assert_cwd_unchanged
		def test_run_datalad_help():
			out, err = check_run_and_get_output("datalad --help")
			ok_startswith(out, "Usage: ")
			# There could be a warning from coverage that no data was collected, should be benign
			lines = [l for l in err.split(os.linesep) if ('no-data-collected' not in l) and l]
	>       eq_(lines, [])

	../datalad/tests/test_installed.py:47:
	_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

	first = ["/tmp/dl-miniconda-jm48jjoo/lib/python3.8/site-packages/requests/__init__.py:102: RequestsDependencyWarning: urllib3 ...ported version!", '  warnings.warn("urllib3 ({}) or chardet ({})/charset_normalizer ({}) doesn\'t match a supported "']
	second = [], msg = None

		def assert_equal(first, second, msg=None):
			if msg is None:
	>           assert first == second
	E           assert ['/tmp/dl-min... supported "'] == []
	E             Left contains 2 more items, first extra item: "/tmp/dl-miniconda-jm48jjoo/lib/python3.8/site-packages/requests/__init__.py:102: RequestsDependencyWarning: urllib3 (1.26.8) or chardet (5.0.0)/charset_normalizer (2.0.4) doesn't match a supported v
	ersion!"
	E             Full diff:
	E               [
	E             -  ,
	E             +  '/tmp/dl-miniconda-jm48jjoo/lib/python3.8/site-packages/requests/__init__.py:102: '
	E             +  'RequestsDependencyWarning: urllib3 (1.26.8) or chardet '
	E             +  "(5.0.0)/charset_normalizer (2.0.4) doesn't match a supported version!",
	E             +  '  warnings.warn("urllib3 ({}) or chardet ({})/charset_normalizer ({}) '
	E             +  'doesn\'t match a supported "',
	E               ]

	../datalad/tests/utils_pytest.py:107: AssertionError

setup.py

@@ -26,7 +26,7 @@
 requires = {
     'core': [
         'platformdirs',
-        'chardet>=3.0.4',      # rarely used but small/omnipresent
+        'chardet>=3.0.4, <5.0.0',      # rarely used but small/omnipresent
         'colorama; platform_system=="Windows"',
         'distro; python_version >= "3.8"',
         'importlib-metadata >=3.6; python_version < "3.10"',