build: 更新 go.mod 并添加新依赖

- 在 go.mod 中添加了 github.com/ECUST-XX/xml v1.20.2 依赖
- 更新了 go.sum 文件以包含新依赖的哈希值
- 在 ServerEvent.go

common/go.sum

@@ -1,6 +1,8 @@
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/toml v1.2.0 h1:Rt8g24XnyGTyglgET/PRUNlrUeu9F5L+7FilkXfZgs0=
 github.com/BurntSushi/toml v1.2.0/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
+github.com/ECUST-XX/xml v1.20.2 h1:xqg5JaYfcGtkXtLcAN0H1sbTWwRdIHjmU/ZRPmtj+8k=
+github.com/ECUST-XX/xml v1.20.2/go.mod h1:AHwv/5bl6dD2mohWd7efbLVKEF+SllOsrynpQVhWM0o=
 github.com/antchfx/xmlquery v1.4.4 h1:mxMEkdYP3pjKSftxss4nUHfjBhnMk4imGoR96FRY2dg=
 github.com/antchfx/xmlquery v1.4.4/go.mod h1:AEPEEPYE9GnA2mj5Ur2L5Q5/2PycJ0N9Fusrx9b12fc=
 github.com/antchfx/xpath v1.3.3 h1:tmuPQa1Uye0Ym1Zn65vxPgfltWb/Lxu2jeqIGteJSRs=