[gtksourceview] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit 4fa1455efc138a05fc3688e1faad20d28075ea0b
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Oct 28 12:04:09 2021 +0200

    Update POTFILES.skip

 po/POTFILES.skip | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 9f321123..d75f202e 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -141,6 +141,7 @@ data/language-specs/sh.lang
 data/language-specs/sml.lang
 data/language-specs/solidity.lang
 data/language-specs/sparql.lang
+data/language-specs/spice.lang
 data/language-specs/sql.lang
 data/language-specs/star.lang
 data/language-specs/sweave.lang