chore: fix invalid YAML

Author: ccoVeille

01-defaults/.golangci.yaml

@@ -4,7 +4,7 @@ linters:
   # They can be disable by moving them to the 'disable' key
   enable:
     # Errcheck is a program for checking for unchecked errors in Go code.
-    - errcheck: null
+    - errcheck
     # Linter for Go source code that specializes in simplifying code.
     - gosimple
     # Vet examines Go source code and reports suspicious constructs.