Use gofumpt from github

.mise.toml

 [tools]
 go = "latest"
 "go:golang.org/x/tools/gopls" = "latest"
+"go:mvdan.cc/gofumpt" = "latest"
 
 [vars]
 fuzzflags = "-fuzztime=120s"
 
 [tasks.fmt]
 description = "Reformat source code"
-tools.gofumpt = "latest"
 sources = ["**/*.go"]
 run = "gofumpt -w --extra ."