fix(build): update dependencies to avoid vulnerabilities

Author: padamstx

requirements-dev.txt

@@ -1,16 +1,16 @@
 # test dependencies
 jproperties
-pytest>=2.8.2
+pytest>=5.0
 responses>=0.10
-python_dotenv>=0.1.5
+python-dotenv>=0.1.5
 pylint>=1.4.4
 tox>=2.9.1
 couchdb>=1.2
 
 # code coverage
 coverage<5
-codecov>=1.6.3
-pytest-cov>=2.2.1
+codecov>=1.6.3,<3.0.0
+pytest-cov>=2.2.1,<3.0.0
 
 # documentation
 recommonmark>=0.2.0

requirements.txt

@@ -1,3 +1,3 @@
 requests>=2.24.0,<3.0
-python_dateutil>=2.5.3
-ibm_cloud_sdk_core>=3.3.1,<4.0.0
+python_dateutil>=2.5.3,<3.0.0
+ibm_cloud_sdk_core>=3.3.4,<4.0.0