multi: update linter, fix new issues

.golangci.yml

@@ -53,7 +53,7 @@ linters-settings:
       - G306 # Poor file permissions used when writing to a new file.
 
   staticcheck:
-    go: "1.18"
+    go: "1.20"
     checks: ["-SA1019"]
 
   lll:
@@ -213,6 +213,11 @@ issues:
       linters:
         - gosec
         - funlen
+        - revive
+
+    - path: mock*
+      linters:
+        - revive
 
     - path: test*
       linters: