update slock submodule - birdwm - Unnamed repository; edit this file 'description' to name the repository.

commit 978c69edb57934a0ce220763418520577853cb21
parent e81eb63ab0858075cf1de4dd1472a7b91755d8f1
Author: grouse <bdmfegys@duck.com>
Date:   Thu,  7 Mar 2024 16:46:50 -0500

update slock submodule

	birdwm Unnamed repository; edit this file 'description' to name the repository.
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