[pkg][new version] Provide eospac@6.5.0beta (#25614)
[pkg][new version] Provide eospac@6.5.0beta (#25614)

* Provide new version of eospac.

+ Provide version 6.5.0beta.
+ Make version 6.4.2 the default

+ Also increment

* volunteer to be the maintainer (for now).
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack