Dockerfile: update golangci-lint to v1.55.2

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.golangci.yml

@@ -18,12 +18,11 @@ linters:
 
 linters-settings:
   depguard:
-    list-type: blacklist
-    include-go-root: true
-    packages:
-      # The io/ioutil package has been deprecated.
-      # https://go.dev/doc/go1.16#ioutil
-      - io/ioutil
+    rules:
+      main:
+        deny:
+          - pkg: "io/ioutil"
+            desc: The io/ioutil package has been deprecated. See https://go.dev/doc/go1.16#ioutil
 
 issues:
   exclude-rules: