Google's crawlers and fetchers support HTTP/1.1 and HTTP/2. The crawlers will use the protocol version that provides the best crawling performance and may switch protocols between sessions depending on previous crawling statistics.
Crawling over HTTP/2 may save computing resources (for example, CPU, RAM) for your site and Googlebot, but otherwise there's no Google-product specific benefit to the site.
To opt out from crawling over HTTP/2, instruct the server that's hosting your site to respond with a 421 HTTP status code when Google attempts to access your site over HTTP/2.
Google began crawling using HTTP/2 for a limited number of URLs in November 2020 and a year later was crawling about half the web on that protocol.
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