[Fix #10174] Fix inherit_from_remote should follow remote includes path starting with ./

[hirasawayuki]

Fixes #10174.
This PR is fix inherit_from_remote should follow remote includes path starting with ./
In the example of issue, it tries to load ./base.yml in the same hierarchy as ruby-2.7.yml, but the uri of ./base.yml is

https://raw.githubusercontent.com/testdouble/standard/main/config/./base.yml.

If the uri is https:// ~ /./base.yml, ConfigLoaderResolver#remote_file? returns false, so an instance of URI::Generic is created and an error occurs.

In this PR, if remote includes path starts with ./, it will be removed.

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[dvandersluis]

Can you please add tests for this change?

[koic]

Thanks!