* Update, fix serenity & serenity-libint
Version 1.6.1 of `serenity` is added, some dependencies are made more
explicit, some options are improved or fixed.
The url of `serenity-libint` is fixed. The old url is not reachable
anymore.
* Use upstream patch, modify cmake patch
* Update var/spack/repos/builtin/packages/serenity/package.py
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Co-authored-by: Tamara Dahlgren <35777542+tldahlgren@users.noreply.github.com>
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