lint: Refresh deprecated config

This fixes
```
$ golangci-lint --version
golangci-lint has version 1.59.1 built with go1.22.3 from 1a55854a on 2024-06-09T18:08:33Z
$ golangci-lint run ./...
WARN [config_reader] The configuration option `output.format` is deprecated, please use `output.formats`
```

The configuration file is updated according to
https://golangci-lint.run/usage/configuration/.

Signed-off-by: Leonard Lyubich <[email protected]>

.golangci.yml

@@ -12,7 +12,8 @@ run:
 # output configuration options
 output:
   # colored-line-number|line-number|json|tab|checkstyle|code-climate, default is "colored-line-number"
-  format: tab
+  formats:
+    - format: tab
 
 # all available settings of specific linters
 linters-settings: