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

[renovate[bot]]

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`](https://togithub.com/splunk/splunk-sdk-python/blob/HEAD/CHANGELOG.md#Version-200) [Compare Source](https://togithub.com/splunk/splunk-sdk-python/compare/1.7.4...2.0.0) ##### 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](https://togithub.com/splunk/splunk-sdk-python/issues/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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