go.mod: updated logfmt dependency (ethereum#25231)

This fixes an issue in abigen tests with go 1.17.

go.mod

@@ -82,9 +82,11 @@ require (
 	github.com/deepmap/oapi-codegen v1.8.2 // indirect
 	github.com/dlclark/regexp2 v1.4.1-0.20201116162257-a2a8dda75c91 // indirect
 	github.com/garslo/gogen v0.0.0-20170306192744-1d203ffc1f61 // indirect
+	github.com/go-logfmt/logfmt v0.4.0 // indirect
 	github.com/go-ole/go-ole v1.2.1 // indirect
 	github.com/go-sourcemap/sourcemap v2.1.3+incompatible // indirect
 	github.com/influxdata/line-protocol v0.0.0-20210311194329-9aa0e372d097 // indirect
+	github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect
 	github.com/mitchellh/mapstructure v1.4.1 // indirect