Maven元数据摘要文件无法被客户端读取

[scplsy]

What happened:
Maven生成maven-metadata.xml文件的checksum文件扩展名为大写，导致无法被客户端访问。
仅在删除版本时，重新生成的maven-metadata.xml的checksum文件为大写。

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• bk-repo version (use cat VERSION in installed dir):
• Cloud provider or hardware configuration:
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: