1.50
or sometimes 150
is the latest release.
The deprecation notes:
Deprecated.
use classes in org.bouncycastle.pkcs.
If you take a close look you will see that this class was moved to a different package: PKCS10CertificationRequest
You will need the following dependency to access that class:
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcpkix-jdk15on</artifactId>
<version>1.50</version>
</dependency>