go: upgrade to Go 1.26 and modernize#97

ggilmore wants to merge 1 commit into

mastersourcegraph/jsonrpc2:masterfrom

go-fix-modernize-v2--270b1737-ed47-45a7-86f7-80feb79e95f9sourcegraph/jsonrpc2:go-fix-modernize-v2--270b1737-ed47-45a7-86f7-80feb79e95f9Copy head branch name to clipboard