update JSch and try to upgrade JCE about keepass2android HOT 1 CLOSED

upgrading JCE might not be feasible, at least not for the Play store version of the app:

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Understanding The Export/Import Issues

JCE for Java SE 8 has been through the U.S. export review process. The
JCE framework, along with the various JCE providers that come standard
with it (SunJCE, SunEC, SunPKCS11, SunMSCAPI, etc), is exportable.

The JCE architecture allows flexible cryptographic strength to be
configured via jurisdiction policy files. Due to the import
restrictions of some countries, the jurisdiction policy files
distributed with the Java SE 8 software have built-in restrictions on
available cryptographic strength. The jurisdiction policy files in this
download bundle (the bundle including this README file) contain no
restrictions on cryptographic strengths. This is appropriate for most
countries. Framework vendors can create download bundles that include
jurisdiction policy files that specify cryptographic restrictions
appropriate for countries whose governments mandate restrictions. Users
in those countries can download an appropriate bundle, and the JCE
framework will enforce the specified restrictions.

You are advised to consult your export/import control counsel or
attorney to determine the exact requirements.

from keepass2android.