fix(plymouth): revert latest version bump

common/overlays/default.nix

@@ -5,6 +5,7 @@
 }: {
   nixpkgs.overlays = [
     (import ./dracula-theme)
+    (import ./plymouth)
     (import ./spotifywm)
     (import ./squeekboard)
 

common/overlays/plymouth/default.nix

@@ -0,0 +1,14 @@
+final: prev: {
+  plymouth = prev.plymouth.overrideAttrs (o: {
+    # https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/236
+    version = "unstable-2023-06-17";
+
+    src = prev.fetchFromGitLab {
+      domain = "gitlab.freedesktop.org";
+      owner = "plymouth";
+      repo = "plymouth";
+      rev = "b1d5aa9d2a6033bba52cf63643e5878f8a9b68a0";
+      hash = "sha256-8DXcwt8CZTni5Ma+I63LzNejlIB0Cr1ATA7Nl3z9z6I=";
+    };
+  });
+}