Update xfce4-terminal

[adsr]

xfce4-terminal now has sixel support. hugo -D is not working for me so I'll paste a diff below.

diff --git a/content/_index.md b/content/_index.md
index 1d5f0fa..6e44da0 100644
--- a/content/_index.md
+++ b/content/_index.md
@@ -289,9 +289,9 @@ Open issue: https://github.com/microsoft/terminal/issues/448.

 # xfce-terminal

-{{< unsupported >}}
+{{< supported >}}

-Open PR: https://gitlab.xfce.org/apps/xfce4-terminal/-/merge_requests/58
+From commit [493a7a5](https://gitlab.xfce.org/apps/xfce4-terminal/-/commit/493a7a54b437df9419847b29fe94eae671816c09) onwards.

[adsr]

(Tangentially, here is the result of hugo -D on my setup. It updates 3 xml files (en-us -> en) but nothing else.)

adam@asx1c9:~/arewesixelyet$ hugo -D 
Start building sites … 
hugo v0.116.1-3e1ea030a5897addaf9d113d0826709fe07f77c0 linux/amd64 BuildDate=2023-08-01T07:24:54Z VendorInfo=gohugoio

WARN  found no layout file for "html" for kind "taxonomy": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.

                   | EN  
-------------------+-----
  Pages            |  3  
  Paginator pages  |  0  
  Non-page files   |  0  
  Static files     |  3  
  Processed images |  0  
  Aliases          |  0  
  Sitemaps         |  1  
  Cleaned          |  0  

Total in 5 ms

[smasher164]

I realize now the reason why this happens is because the theme is located in a submodule. So if that isn't cloned, then hugo -D will throw a warning.