fix broken dependency specifications

    wildcard specifiers such as `cloudpickle>=1.6.*` are invalid
    since packaging 22.0, see also discussion at
    pypa/packaging#645

Author: uweschmitt

setup.py

@@ -28,11 +28,11 @@
         'nbconvert>=6.0.0',
         'nbformat>=5.1.3',
         'html2text==2020.1.16',
-        'cloudpickle>=1.6.*',
-        'click>=7.1.*',
-        'Pygments>=2.10.*',
-        'colorama>=0.4.*',
-        'beautifulsoup4>=4.10.*',
+        'cloudpickle>=1.6',
+        'click>=7.1',
+        'Pygments>=2.10',
+        'colorama>=0.4',
+        'beautifulsoup4>=4.10',
         'lxml',
     ],
     extras_require={