chore(deps): update dependency splunk-sdk to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
splunk-sdk	^1.7.2 -> ^2.0.0

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Release Notes

splunk/splunk-sdk-python (splunk-sdk)

v2.0.0

Compare Source

Feature updates

• ensure_binary, ensure_str and assert_regex utility methods have been migrated from six.py to splunklib/utils.py

Major changes

• Removed code specific to Python 2
• Removed six.py dependency
• Removed __future__ imports
• Refactored and Updated splunklib and tests to utilize Python 3 features
• Updated CI test matrix to run with Python versions - 3.7 and 3.9
• Refactored Code throwing deprecation warnings
• Refactored Code violating Pylint rules

Bug fixes

• #​527 Added check for user roles
• Fix to access the metadata "finished" field in search commands using the v2 protocol
• Fix for error messages about ChunkedExternProcessor in splunkd.log for Custom Search Commands

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