Update minimum version of requests dependency we require as part of

install_requires in setup.py to 2.26.0 when running under Python >= 3.6.

This was done to avoid potential licensing issue with transitive
dependency of the requests library (chardet).

NOTE: Since requests 2.26.0 dropped support for Python 3.5 which we
still stupport, requests >= 2.25.1 is required when running under Python
3.5.

Thanks to Jarek Potiuk - @potiuk for reporting this issue.

Resolves apache#1594.

requirements-tests.txt

@@ -5,7 +5,8 @@ pylint==2.4.4
 mock==3.0.5
 codecov==2.1.12
 coverage==4.5.4
-requests
+requests>=2.25.0; python_version <= '3.5'
+requests>=2.26.0; python_version >= '3.6'
 requests_mock
 # 5.3.2 is latest version which still supports Python 3.5, >= 6.2.5 is needed for Python 3.10
 pytest==5.3.2; python_version <= '3.5'

setup.py

@@ -173,9 +173,16 @@ def get_data_files(dname, ignore=None, parent=None):
 # setuptools >= 36.2
 # For installation, minimum required pip version is 1.4
 # Reference: https://hynek.me/articles/conditional-python-dependencies/
-INSTALL_REQUIREMENTS = [
-    'requests>=2.5.0',
-]
+# We rely on >= 2.26.0 to avoid issues with LGL transitive dependecy
+# See https://github.com/apache/libcloud/issues/1594 for more context
+INSTALL_REQUIREMENTS = []
+
+if sys.version_info < (3, 6, 0):
+    # requests 2.26.0 doesn't support Python 3.5 anymore
+    INSTALL_REQUIREMENTS.append('requests>=2.25.1')
+else:
+    INSTALL_REQUIREMENTS.append('requests>=2.26.0')
+
 
 setuptools_version = tuple(setuptools.__version__.split(".")[0:2])
 setuptools_version = tuple([int(c) for c in setuptools_version])