[Go] Prepare SDK 5.1.4 release

[RongtongJin]

Summary

Prepare the RocketMQ Go SDK 5.1.4 release.

Changes:

• bump Go client metadata version to 5.1.4
• bump Go user-agent version to 5.1.4
• adjust two Go producer examples so go test ./... passes vet without redundant newline warnings

Validation

• go test ./... from golang/

[guyinyou]

lgtm

[RockteMQ-AI]

Review by github-manager-bot

Summary

Prepares the Go SDK 5.1.4 release: bumps version metadata in two files and fixes go vet warnings in two example programs.

Findings

• [Info] metadata.go:34 and user_agent.go:32 — Version bumps from 5.0.1-rc1 to 5.1.4 are consistent across both files. ✅
• [Info] delay_recall/main.go:70 and priority/main.go:70 — Replacing fmt.Println("...\n") with fmt.Println("...") + fmt.Println() correctly eliminates the redundant newline warning from go vet. ✅

Suggestions

No concerns. Version metadata is consistent, example fixes are clean. LGTM.

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Automated review by github-manager-bot