The HTTP/2 protocol was published in 2015 with the aim of creating a faster, more secure Internet.
As with so many website improvements nowadays, the SEO impact will be felt indirectly. Google does not factor HTTP/2 readiness into its algorithms, but it does reward sites that provide a slick user experience. That includes page load speed, so it is fair to say that moving to HTTP/2 will have a positive effect on a site’s SEO performance.