test: disable gofumpt for now and fix language version

Author: morremeyer

.golangci.yml

@@ -30,7 +30,10 @@ linters:
   enable:
     - gocyclo
     - godot
-    - gofumpt
+    # Disabled as the latest version - 0.4.0 from 2022-09-27 is not built with go 1.19 and
+    # therefore disagrees with swag fmt about the formatting of the swagger comments.
+    # See https://github.com/mvdan/gofumpt/issues/254
+    # - gofumpt
     - goimports
     - govet
     - revive
@@ -39,7 +42,7 @@ linters:
 
 linters-settings:
   gofumpt:
-    lang-version: "1.20"
+    lang-version: "1.19"
     extra-rules: true
   gocyclo:
     min-complexity: 15