upgrade step to add robots.txt rule for googlebot

[coveralls]

Pull Request Test Coverage Report for Build 6708202334

• 27 of 30 (90.0%) changed or added relevant lines in 1 file are covered.
• 63 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.8%) to 63.36%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/redturtle/volto/setuphandlers.py	27	30	90.0%
<!--	Total:	27	30	90.0%	-->

Files with Coverage Reduction	New Missed Lines	%
src/redturtle/volto/restapi/services/search/get.py	2	89.58%
src/redturtle/volto/browser/fix_links.py	24	16.96%
src/redturtle/volto/restapi/services/querystringsearch/get.py	37	47.4%
<!--	Total:	63		-->

Totals
Change from base Build 6637782940:	0.8%
Covered Lines:	792
Relevant Lines:	1250

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💛 - Coveralls