Change to url safe base64

[JProgrammer]

Pagination requests are often carried via query parameters for GET requests, as such usingstrict_decode64 will require escaping for some characters and the use of padding = is not needed to carry the information.

[fatkodima]

Can you please elaborate more on what the problem is, with an example, and probably add a test case and changelog entry?

[JProgrammer]

This is a good summary of the problem with base64 and urls, https://base64.guru/standards/base64url

I'm not sure it's explicitly testable unless test of base Ruby is desired, though I can update the change log and read me to reflect the change

[fatkodima]

Thank you very much for contributing!