fix: declare lxml as a runtime dependency (v1.6.1)

contentstack_utils.utils imports lxml.etree at module load time, but
install_requires has been empty since initial release. Declare lxml with
environment markers: >=6.1.0 on Python 3.8+ (aligned with requirements.txt),
>=4.9.0,<5 on 3.6–3.7.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: AleksandrSl

CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## v1.6.1 (2026-07-09)
+
+### Bug fix: Declare runtime dependency on lxml
+
+- Added `lxml` to `install_requires` with environment markers: `>=6.1.0` on
+  Python 3.8+ (matching dev `requirements.txt`), `>=4.9.0,<5` on 3.6–3.7.
+  `contentstack_utils.utils` imports `lxml.etree` at module load time, but
+  previous releases shipped with an empty `install_requires`, so
+  `pip install contentstack-utils` did not install lxml.
+
 ## v1.6.0 (2026-06-22)
 
 ### New feature: Multi-region endpoint resolution

contentstack_utils/__init__.py

@@ -39,6 +39,6 @@
 __title__ = 'contentstack_utils'
 __author__ = 'contentstack'
 __status__ = 'debug'
-__version__ = '1.6.0'
+__version__ = '1.6.1'
 __endpoint__ = 'cdn.contentstack.io'
 __contact__ = 'support@contentstack.com'

setup.py

@@ -34,9 +34,11 @@ def run(self):
     long_description_content_type="text/markdown",
     url="https://github.com/contentstack/contentstack-utils-python",
     license='MIT',
-    version='1.6.0',
+    version='1.6.1',
     install_requires=[
-
+        # lxml 6.x requires Python 3.8+; keep 4.x for 3.6–3.7 (python_requires>=3.6).
+        "lxml>=4.9.0,<5; python_version<'3.8'",
+        "lxml>=6.1.0; python_version>='3.8'",
     ],
     setup_requires=['pytest-runner'],
     tests_require=['pytest==4.4.1'],