Bump assets/themes/onehalf from `fdcbffe` to `970abdf`

Bumps [assets/themes/onehalf](https://github.com/sonph/onehalf) from `fdcbffe` to `970abdf`.
- [Release notes](https://github.com/sonph/onehalf/releases)
- [Commits](fdcbffe317...970abdf26b)

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

assets/themes/onehalf

@@ -1 +1 @@
-Subproject commit fdcbffe3175c29bb78d19dcaf9b2a456482fcf1e
+Subproject commit 970abdf26b399100cbb59c6b6e693c4ff877c59d