chore(deps): update splunk/addonfactory-test-matrix-action action to v2.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
splunk/addonfactory-test-matrix-action	action	patch	v2.1.8 -> v2.1.9

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Release Notes

splunk/addonfactory-test-matrix-action (splunk/addonfactory-test-matrix-action)

### [`v2.1.9`](https://redirect.github.com/splunk/addonfactory-test-matrix-action/releases/tag/v2.1.9) [Compare Source](https://redirect.github.com/splunk/addonfactory-test-matrix-action/compare/v2.1.8...v2.1.9) ##### Bug Fixes - bump Splunk version ([#​178](https://redirect.github.com/splunk/addonfactory-test-matrix-action/issues/178)) ([90273fb](https://redirect.github.com/splunk/addonfactory-test-matrix-action/commit/90273fb7c1a00c485bdca72cde57f6b07267ac44))

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