Update bundled JDK to JDK-21

**Is your feature request related to a problem? Please describe.**
The JDK-21 distributions become available for most of the platforms https://adoptium.net/temurin/releases/

**Describe the solution you'd like**
Update bundled JDK to JDK-21 in `main` and `2.x` branches

**Describe alternatives you've considered**
N/A

**Additional context**
N/A
