add missing depth value to 'Touching but Not Connected' in CSV file.

It was missing live site until I noticed it here. I've updated the live site and
added it to the data/artwork-2023-03-21.csv file in this repository. I've added
the change to the dated version of the data (CSV file) because it was easier to
do than re-download the latest version of the database from the live site, clean
the database, read the new CSV file into artworks.org and process that data --
with a new dataframe. The artwork.org file will need an update stating this, though.

data/artwork-2023-03-21.csv

@@ -335,7 +335,7 @@ id,title,slug,published,category,width,height,depth,pixel_width,pixel_height,pla
 335,The 7ft Man,the-7ft-man,2014-07-27 07:30:00.000,Drawing,50,70,,,,,Watercolour on paper,2022-04-11,
 336,Implied Horizon,implied-horizon,2014-07-12 22:47:00.000,Drawing,29.7,42,,,,,Watercolour on paper,2022-04-11,
 337,No Mans Land,no-mans-land,2014-07-12 07:22:00.000,Drawing,29.7,42,,,,,Watercolour on paper,2022-04-11,
-338,"Touching but Not Connected (A.K.A. 2 Spaces, 1 Piece)",touching-but-not-connected,2019-12-09 21:17:00.000,Sculpture,6.5,18,,,,,Glass light bulb and jar,2022-04-11,
+338,"Touching but Not Connected (A.K.A. 2 Spaces, 1 Piece)",touching-but-not-connected,2019-12-09 21:17:00.000,Sculpture,6.5,18,7,,,,Glass light bulb and jar,2022-04-11,
 339,The Space Between,the-space-between,2020-06-14 22:41:00.000,Prints,15.5,22.8,,,,,Digital Print,2022-04-11,
 340,"Us, Us and Them",us-us-and-them,2021-01-23 15:42:00.000,Drawing,50,70,,,,,Felt tip marker on paper,2022-04-11,
 341,A Line of Lines,a-line-of-lines,2021-07-13,Drawing,14.8,21,,,,,Staples on paper,2022-04-11 00:00:00.000000Z,2022-07-19 04:24:11.450281Z