Inline indirect gopkg.in/yaml.v3 dependency

[pietern]

Summary

• Move gopkg.in/yaml.v3 from a standalone indirect require line into the grouped indirect block via go mod tidy
• Migrate from gopkg.in/yaml.v3 to go.yaml.in/yaml/v3 #4353 migrated direct imports to go.yaml.in/yaml/v3 and moved gopkg.in/yaml.v3 into the grouped indirect block
• Config remote sync command #4289 added a direct dependency on gopkg.in/yaml.v3 (via palantir/pkg/yamlpatch), pulling it back out as a standalone require line
• Make config-remote-sync patching logic more generic #4400 marked it as // indirect but left it as a standalone line

Test plan

• go mod tidy produces no diff

This pull request was AI-assisted by Isaac.