ci: migrate goreleaser config to v2 schema

Use 'formats: [tar.gz]' / 'formats: [zip]' instead of deprecated
singular 'format'. goreleaser v2 errors on deprecated fields by default.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Lyckabc

.goreleaser.yaml

@@ -25,11 +25,11 @@ builds:
       - -s -w
 
 archives:
-  - format: tar.gz
+  - formats: [tar.gz]
     name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
     format_overrides:
       - goos: windows
-        format: zip
+        formats: [zip]
 
 checksum:
   name_template: checksums.txt