chore: use gofumpt for code formatting

internal/publicip/api/multi.go

@@ -14,7 +14,8 @@ import (
 // an error is returned, so the results returned should be considered
 // incomplete in this case.
 func FetchMultiInfo(ctx context.Context, fetcher Fetcher, ips []netip.Addr) (
-	results []models.PublicIP, err error) {
+	results []models.PublicIP, err error,
+) {
 	ctx, cancel := context.WithCancel(ctx)
 
 	type asyncResult struct {