Bump VENDOR_VERSION in gems.rb

[dduugg]

Per the code comment, it seems I should bump this after ignoring a pair of committed vendored gems in #16259 :

https://github.com/Homebrew/brew/pull/16259/files#diff-bc37d034bad564583790a46f19d807abfe519c5671395fd494d8cce506c42947R102 https://github.com/Homebrew/brew/pull/16259/files#diff-bc37d034bad564583790a46f19d807abfe519c5671395fd494d8cce506c42947R109

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[Bo98]

Looks like the workflow I have to check for this doesn't have the correct paths: triggers - I'll fix that!