fix(deps): update dependency sitemap to ^7.1.1 for gatsby-plugin-sitemap

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sitemap	^7.0.0 -> ^7.1.1

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Release Notes

ekalinin/sitemap.js

v7.1.1

Compare Source

• fix #​378 exit code not set on parse failure. A proper error will be set on the stream now.
• fix #​384 thanks @​tomcek112 parseSitemapIndex not included in 7.1.0 release
• fix #​356 thanks @​vandres - SitemapIndexStream now has lastmodDateOnly
• Fix #​375 thanks @​huntharo parseSitemap and parseSitemapIndex uncatchable errors
• Filter out null as well when writing XML thanks @​huntharo #​376

v7.1.0

Compare Source

• bumped types dependency for node
• bumped all dev dependencies - includes some prettier changes
• package-lock updated to version 2

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