CompatHelper: bump compat for "StatsBase" to "0.33"

[github-actions]

This pull request changes the compat entry for the StatsBase package from 0.26,0.27,0.28,0.29,0.30,0.31,0.32 to 0.26,0.27,0.28,0.29,0.30,0.31,0.32, 0.33.

This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[coveralls]

Pull Request Test Coverage Report for Build 107

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.265%

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Totals
Change from base Build 105:	0.0%
Covered Lines:	204
Relevant Lines:	226

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💛 - Coveralls