fix(deps): Relax the minimum required go version (#5022)

Setting the `go` directive to a patch version above `.0` causes issues
for downstream code bases that have their `go` directive set to the `.0`
patch version of Go.

Author: nhhagen

go.mod

@@ -1,8 +1,6 @@
 module github.com/grpc-ecosystem/grpc-gateway/v2
 
-go 1.22.7
-
-toolchain go1.23.4
+go 1.22.0
 
 require (
 	github.com/antihax/optional v1.0.0