Update Python dependencies

Author: mdmintz

requirements.txt

@@ -8,7 +8,7 @@ setuptools>=56.1.0;python_version>="3.6"
 setuptools-scm==5.0.2;python_version<"3.6"
 setuptools-scm>=6.0.1;python_version>="3.6"
 wheel>=0.36.2
-attrs>=20.3.0
+attrs>=21.2.0
 PyYAML>=5.4.1;python_version>="3.6"
 certifi>=2020.12.5
 six==1.16.0

setup.py

@@ -123,7 +123,7 @@
         'setuptools-scm==5.0.2;python_version<"3.6"',
         'setuptools-scm>=6.0.1;python_version>="3.6"',
         "wheel>=0.36.2",
-        "attrs>=20.3.0",
+        "attrs>=21.2.0",
         'PyYAML>=5.4.1;python_version>="3.6"',
         "certifi>=2020.12.5",
         "six==1.16.0",
@@ -178,7 +178,7 @@
         'traitlets==5.0.5;python_version>="3.7"',
         'prompt-toolkit==1.0.18;python_version<"3.6"',
         'prompt-toolkit==3.0.18;python_version>="3.6"',
-        'decorator==4.4.2',
+        "decorator==4.4.2",
         'ipython==5.10.0;python_version<"3.5"',
         'ipython==6.5.0;python_version>="3.5" and python_version<"3.6"',
         'ipython==7.16.1;python_version>="3.6" and python_version<"3.7"',