[security] Alpine version old , leading to Security vulnerabilities

[nitinSophos]

Bug Description

We are using Old Alpine Image 3.12.0 , latest is 3.15.0 Old alpin image has multiple vulnerabilities including Libssl 1.1.1k , and LibreSSL. (This is not an exhaustive list)

Fix: Update alpine base image in both frpc and frps docker image.

frpc Version

0.38.0

frps Version

0.38.0

System Architecture

linux/amd64

Configurations

N/A

Logs

N/A

Steps to reproduce

No response

Affected area

• [ ] Docs
• [ ] Installation
• [ ] Performance and Scalability
• [X] Security
• [ ] User Experience
• [ ] Test and Release
• [ ] Developer Infrastructure
• [ ] Client Plugin
• [ ] Server Plugin
• [ ] Extensions
• [ ] Others

[nitinSophos]

Raised PR: https://github.com/fatedier/frp/pull/2731