Update blessed requirement

Updates the requirements on [blessed](https://github.com/jquast/blessed) to permit the latest version.

Updates `blessed` to 1.39.0
- [Release notes](https://github.com/jquast/blessed/releases)
- [Changelog](https://github.com/jquast/blessed/blob/master/docs/history.rst)
- [Commits](https://github.com/jquast/blessed/commits)

---
updated-dependencies:
- dependency-name: blessed
  dependency-version: 1.39.0
  dependency-type: direct:production
  dependency-group: prod-dependencies
...

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

Author: dependabot[bot]

is-unicode-supported/pyproject.toml

@@ -18,7 +18,7 @@ license-files = [
     "docs/LICENSE.md",
 ]
 dependencies = [
-    "blessed>=1.38.0,<2",
+    "blessed>=1.39.0,<2",
     "colorama>=0.4.6,<1 ; platform_system == 'Windows'",
     "is-legacy-terminal>=1.1.1,<2",
     "json5>=0.14.0,<1",