chore: add Jan Kowalleck as a maintainer

Signed-off-by: Jan Kowalleck <jan.kowalleck@gmail.com>

Author: jkowalleck

pyproject.toml

@@ -3,7 +3,10 @@ name = "cyclonedx-python-lib"
 version = "3.1.3"
 description = "A library for producing CycloneDX SBOM (Software Bill of Materials) files."
 authors = ["Paul Horton <phorton@sonatype.com>"]
-maintainers = ["Paul Horton <phorton@sonatype.com>"]
+maintainers = [
+  "Paul Horton <phorton@sonatype.com>",
+  "Jan Kowalleck <jan.kowalleck@gmail.com>",
+]
 license = "Apache-2.0"
 readme = "README.md"
 homepage = "https://github.com/CycloneDX/cyclonedx-python-lib"
@@ -12,7 +15,7 @@ packages = [
     { include = "cyclonedx" }
 ]
 include = [
-    "LICENSE"
+    "LICENSE",
 ]
 classifiers = [
     # Trove classifiers - https://packaging.python.org/specifications/core-metadata/#metadata-classifier