gnu: swaylock: Update to 1.6.

* gnu/packages/wm.scm (swaylock): Update to 1.6.

gnu/packages/wm.scm

@@ -1653,7 +1653,7 @@ modules for building a Wayland compositor.")
 (define-public swaylock
   (package
     (name "swaylock")
-    (version "1.5")
+    (version "1.6")
     (source
      (origin
        (method git-fetch)
@@ -1662,7 +1662,7 @@ modules for building a Wayland compositor.")
              (commit version)))
        (file-name (git-file-name name version))
        (sha256
-        (base32 "0r95p4w11dwm5ra614vddz83r8j7z6gd120z2vcchy7m9b0f15kf"))))
+        (base32 "1ihdvx6gdinzabvnazjmkk3ajrp7ngg0jzfwcjqn4hcjv64s0lam"))))
     (build-system meson-build-system)
     (inputs (list cairo gdk-pixbuf libxkbcommon
                   ;("linux-pam" ,linux-pam) ; FIXME: Doesn't work.