[gtksourceview] Update POTFILES.skip

[Piotr Drąg <piotrdrag src gnome org>]

commit 5fca9647650fada1a990540b8c0b0a8a9645bedc
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat Jun 25 12:53:59 2022 +0200

    Update POTFILES.skip

 po/POTFILES.skip | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index b132c100..aacb061b 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -156,6 +156,7 @@ data/language-specs/terraform.lang
 data/language-specs/texinfo.lang
 data/language-specs/thrift.lang
 data/language-specs/toml.lang
+data/language-specs/twig.lang
 data/language-specs/typescript-js-expressions.lang
 data/language-specs/typescript-js-functions-classes.lang
 data/language-specs/typescript-js-literals.lang