Replace Certificate Pinning Library

Moxie0's pinning library is insecure and unmaintained. https://github.com/moxie0/AndroidPinning see https://github.com/moxie0/AndroidPinning/issues/29 This can be fixed by using current okHttpClient's pinning mechanism. Check that out: https://www.synopsys.com/blogs/software-security/ineffective-certificate-pinning-implementations/

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