pem-keystore-2.4.0

What's Changed

• Bump io.undertow:undertow-core from 2.2.24.Final to 2.3.13.Final
• Bump org.bouncycastle:bcprov-jdk18on from 1.77 to 1.78 by @dependabot in #24
• Drop CI tests for Java 8 (due to io.undertow:undertow-core 2.3.x)

Full Changelog: pem-keystore-2.3.0...pem-keystore-2.4.0