[ofiwg] Libfabric v1.20.1, v1.19.1, and v1.18.3 are available

[Xiong, Jianxin]

Bug fix releases for branch v1.20.x, v1.19.x, and v1.18.x are available at:

https://github.com/ofiwg/libfabric/releases/tag/v1.20.1
https://github.com/ofiwg/libfabric/releases/tag/v1.19.1
https://github.com/ofiwg/libfabric/releases/tag/v1.18.3

The list if fixes for each of the releases can be found here:
https://github.com/ofiwg/libfabric/blob/v1.20.1/NEWS.md
https://github.com/ofiwg/libfabric/blob/v1.19.1/NEWS.md
https://github.com/ofiwg/libfabric/blob/v1.18.3/NEWS.md

-Jianxin