[releng] Issue #7712: Reassign lzma maintenance

[Antonio Trande]

sagitter reported a new issue against the project: `releng` that you are following:
``
* Name of the package?
lzma

* Maintainer's FAS username?
sagitter

* Any extra information?
Although [LZMA Utils are no longer developed and replaced by XZ](https://tukaani.org/lzma/), they're still required by other packages on Fedora.
lzma package is still correctly compiled on fedora 28+, it can endure for a little while yet as long as all dependent software migrate to XZ.
``

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https://pagure.io/releng/issue/7712