Setup xk6

Version updated for https://github.com/grafana/setup-xk6 to version v1.1.0.

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Release notes

Accept leading ‘v’ in version number parameter (xk6-version).

This change would allow users to specify the target xk6 version using common tagging conventions, such as:

• xk6-version: '0.10.1'
• xk6-version: 'v0.10.1'

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