Let's encrypt certificates not working for Android 7.0 and earlier

[jurajhilje]

Description

Let's encrypt is phasing out their certificate cross-signing that allowed Android Devices prior to 7.1.1 to establish TLS connections.

This results in a javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found. exception for every domain that renewed their certificate after that date.