feat: nginx 采集插件添加对 tengine request_time 采集支持

[0x0034]

Active connections: 13495
server accepts handled requests request_time
 250674001 250674001 243630421 99268364027350
Reading: 0 Writing: 13487 Waiting: 7

1. 添加对request_time 指标采集支持
2. 更新 sonic 版本

[Copilot]

Pull request overview

This pull request adds support for collecting the request_time metric from Tengine's nginx status endpoint and updates the sonic JSON library to version 1.15.0.

Changes:

• Added parsing logic for the optional 4th field (request_time) in the nginx stub_status response, which is specific to Tengine
• Updated github.com/bytedance/sonic from v1.9.1 to v1.15.0 and added related dependencies
• Moved github.com/elastic/go-sysinfo from indirect to direct dependency (likely from running go mod tidy)

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
inputs/nginx/nginx.go	Added conditional parsing for the optional request_time field when it exists in the status response
go.mod	Updated sonic library to v1.15.0, added new dependencies (gopkg, sonic/loader, cloudwego/base64x), moved elastic/go-sysinfo to direct dependency, and updated klauspost/cpuid/v2
go.sum	Updated checksums for all modified and new dependencies

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[kongfei605]

Tahnk you @0x0034