Update licenseheaders requirement from <0.8.6 to <0.8.9 (#8)

* Update licenseheaders requirement from <0.8.6 to <0.8.9

Updates the requirements on [licenseheaders](https://github.com/johann-petrak/licenseheaders) to permit the latest version.
- [Release notes](https://github.com/johann-petrak/licenseheaders/releases)
- [Commits](johann-petrak/licenseheaders@v0.4...v0.8.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

* 📰 Automatic changes ⚙ Adding news file

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

Author: dependabot[bot]

news/202108110242.bugfix

@@ -0,0 +1 @@
+Dependency upgrade: licenseheaders-lt-0.8.9

setup.py

@@ -61,7 +61,7 @@
         "twine",
         "boto3",
         "packaging",
-        "licenseheaders<0.8.6",
+        "licenseheaders<0.8.9",
         "spdx-tools",
         "license-expression",
         "wcmatch",