fix: golangci-lint with -mod=vendor

Signed-off-by: Yoan Blanc <yoan@dosimple.ch>

.golangci.yml

@@ -2,6 +2,9 @@ run:
   # timeout for analysis, e.g. 30s, 5m, default is 1m
   deadline: 10m
 
+  # Modules download mode. If not empty, passed as -mod=<mode> to go tools
+  module-download-mode: vendor
+
   tests: false
 
   # which dirs to skip: they won't be analyzed;