build: go 1.24

We were running behind and there were quite some deprecations to update.
This was mostly in the upstream copy/pasta package but seems quite
minimal.

vendor/google.golang.org/protobuf/encoding/protojson/decode.go

@@ -192,11 +192,6 @@ func (d decoder) unmarshalMessage(m protoreflect.Message, skipTypeURL bool) erro
 				fd = fieldDescs.ByTextName(name)
 			}
 		}
-		if flags.ProtoLegacy {
-			if fd != nil && fd.IsWeak() && fd.Message().IsPlaceholder() {
-				fd = nil // reset since the weak reference is not linked in
-			}
-		}
 
 		if fd == nil {
 			// Field is unknown.