Update libcst requirement from <1.5,>=1.1 to >=1.1,<1.6 (#877)

Updates the requirements on [libcst](https://github.com/Instagram/LibCST) to permit the latest version.
- [Release notes](https://github.com/Instagram/LibCST/releases)
- [Changelog](https://github.com/Instagram/LibCST/blob/main/CHANGELOG.md)
- [Commits](Instagram/LibCST@v1.1.0...v1.5.0)

---
updated-dependencies:
- dependency-name: libcst
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -13,7 +13,7 @@ description = "A pluggable framework for building codemods in Python"
 dependencies = [
     "GitPython<4",
     "isort>=5.12,<5.14",
-    "libcst>=1.1,<1.5",
+    "libcst>=1.1,<1.6",
     "packaging>=23.2,<25.0",
     "pydantic~=2.9.0",
     "pylint>=3.3,<3.4",