DiffAbsInDuration must upgrade go version to 1.9+

[xu9374]

in v2.3.9+ ，DiffAbsInDuration used Duration.Abs()，but this func must in go version 1.9+，see api: audit for Go 1.19 and time: add Duration.Abs
if my go version is below 1.9, it will not compile successfully. report github.com/golang-module/carbon/v2@v2.3.10/difference.go:212:40](http://github.com/golang-module/carbon/v2@v2.3.10/difference.go:212:40): end.StdTime().Sub(c.StdTime()).Abs undefined (type time.Duration has no field or method Abs)
Do you need to update the documentation to explain that you need to use go 1.9+ after version 2.3.9+?

[gouguoyin]

Thank you for your feedback. I will pay attention to this issue

[gouguoyin]

The next version will implement Abs method by itself

[gouguoyin]

V2.3.11 has been optimized and released