Bump assets/themes/onehalf from `970abdf` to `3aa42a3`

Bumps [assets/themes/onehalf](https://github.com/sonph/onehalf) from `970abdf` to `3aa42a3`.
- [Release notes](https://github.com/sonph/onehalf/releases)
- [Commits](970abdf26b...3aa42a39ed)

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

assets/themes/onehalf

@@ -1 +1 @@
-Subproject commit 970abdf26b399100cbb59c6b6e693c4ff877c59d
+Subproject commit 3aa42a39ed3cddde0c53976a700b81b8a7067890