Bump assets/themes/onehalf from `2516b37` to `fdcbffe`

Bumps [assets/themes/onehalf](https://github.com/sonph/onehalf) from `2516b37` to `fdcbffe`.
- [Release notes](https://github.com/sonph/onehalf/releases)
- [Commits](2516b37c3f...fdcbffe317)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

assets/themes/onehalf

@@ -1 +1 @@
-Subproject commit 2516b37c3f201f3d9f2ee194f00fbb20c1ca7413
+Subproject commit fdcbffe3175c29bb78d19dcaf9b2a456482fcf1e