Remove Applet references

[dmatej]

Applet is deprecated from JDK since version 9.
ORBImpl class uses it - and many other classes too.

[UNIITY-Team]

No longer compatible with current JDK 26 !

[pzygielo]

• Bug Report: Payara (CORBA module) still refers to java.applet package in OSGi manifest / FISH-13436 payara/Payara#8101 (comment)