Fix warning of deprecated setting in golangci-lint (#2010)

Author: johscheuer

.golangci.yml

@@ -68,9 +68,10 @@ linters:
 
 linters-settings:
   errcheck:
-    # path to a file containing a list of functions to exclude from checking
-    # see https://github.com/kisielk/errcheck#excluding-functions for details
-    exclude: errcheck_excludes.txt
+    exclude-functions:
+      - (io.Closer).Close
+      - (*os.File).Close
+      - (github.com/FoundationDB/fdb-kubernetes-operator/pkg/fdbadminclient.AdminClient).Close
   govet:
     enable:
       - shadow