cfn-lint -u fails with "FutureWarning: Possible nested set at position 7 re.compile(p, re.UNICODE)"

[tekdj7]

cfn-lint version: (cfn-lint --version)
0.52.0

Description of issue.
When doing a cfn-lint -u, I get the below error:

/venvs/cfn-lint/lib/python3.8/site-packages/cfnlint/maintenance.py:333: FutureWarning: Possible nested set at position 7
  re.compile(p, re.UNICODE)

[PatMyron]

thought we should handle this gracefully:

cfn-lint/src/cfnlint/maintenance.py

Lines 330 to 339 in 29886f4

	try:
	if '\\p{' in p:
	continue
	re.compile(p, re.UNICODE)
	results['.'.join(names + [propname])].update({
	'AllowedPatternRegex': p
	})
	except: #pylint: disable=bare-except
	LOGGER.info(
	'Unable to handle regex for type %s and property %s with regex %s', names[0], propname, p)

but for context the pattern is ^[A-Z][[A-Z]_]*$ @noahrin

[kddejong]

aws-cloudformation/aws-cloudformation-resource-providers-applicationinsights#9

[kddejong]

We test patterns now and we shouldn't see this issue.