build(deps): bump third_party/cctz from `d139743` to `70c3bd1` (#2456)

Bumps [third_party/cctz](https://github.com/google/cctz) from `d139743` to `70c3bd1`.
- [Release notes](https://github.com/google/cctz/releases)
- [Commits](https://github.com/google/cctz/compare/d1397431006ea1362a5914d4a90b265d0c7c6f2c...70c3bd1a22289977332e4c567618ffe94dc414f8)

---
updated-dependencies:
- dependency-name: third_party/cctz
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/third_party/cctz b/third_party/cctz
index d139743..70c3bd1 160000
--- a/third_party/cctz
+++ b/third_party/cctz
@@ -1 +1 @@
-Subproject commit d1397431006ea1362a5914d4a90b265d0c7c6f2c
+Subproject commit 70c3bd1a22289977332e4c567618ffe94dc414f8