s6-rc: fix source hash

The tarball appears to have been re-uploaded, because both
Profpatsch[1] and r-rmcgibbo[2] got the previous hash, but by the time
it got to Hydra, the hash had changed[3].

By getting Profpatsch to send me his cached tarball, and comparing
each to the s6-rc git repo, I've determined that the difference
between them is a fast-forward of 7cadbf1..3d1af07 (summarised below).

So I think we're fine to bump the hash — it looks like some commits
were just mistakenly excluded the first time round.

Laurent Bercot (2):
      Add lock-fd support
      version: 0.5.2.3

 NEWS                                   | 1 +
 src/libs6rc/s6rc_servicedir_internal.c | 1 +
 src/s6-rc/s6-rc-compile.c              | 9 +++++++++
 3 files changed, 11 insertions(+)

[1]: https://github.com/NixOS/nixpkgs/pull/139544
[2]: https://github.com/NixOS/nixpkgs/pull/139544#issuecomment-927332319
[3]: https://hydra.nixos.org/build/154845872

pkgs/tools/system/s6-rc/default.nix

@@ -5,7 +5,7 @@ with skawarePackages;
 buildPackage {
   pname = "s6-rc";
   version = "0.5.2.3";
-  sha256 = "1f92dxw1n8r8avamixi9k0gqbnkpm0r3fmwzz7jd82g6bb2vsg5z";
+  sha256 = "1xyaplwzvqnb53mg59a7jklakzwsiqivp6qggsry3sbaw4hf3d5j";
 
   description = "A service manager for s6-based systems";
   platforms = lib.platforms.unix;