ci: Upgrade libraries previously blocked by 3.4

requirements/tests.in

@@ -1,7 +1,5 @@
 pytest < 5.0.0  # For Python < 3.5
 readme_renderer
 
-docutils < 0.16             # via readme_renderer; for Python 3.4
-importlib-metadata < 1.2.0  # via pluggy, pytest; for Python 3.4
 more-itertools < 6.0.0      # via pytest, zipp; for Python < 3.5
 zipp < 2.0.0                # via importlib-metadata; for Python < 3.6

requirements/tests.txt

@@ -7,17 +7,17 @@
 atomicwrites==1.3.0       # via pytest
 attrs==19.3.0             # via pytest
 bleach==3.1.1             # via readme-renderer
-docutils==0.15.2          # via -r requirements/tests.in, readme-renderer
-importlib-metadata==1.1.3  # via -r requirements/tests.in
-more-itertools==5.0.0     # via -r requirements/tests.in, pytest
-packaging==20.1           # via pytest
+docutils==0.16            # via readme-renderer
+importlib-metadata==1.5.0  # via pluggy, pytest
+more-itertools==5.0.0     # via -r requirements/tests.in (line 4), pytest
+packaging==20.3           # via pytest
 pluggy==0.13.1            # via pytest
 py==1.8.1                 # via pytest
-pygments==2.3.1           # via readme-renderer
+pygments==2.5.2           # via readme-renderer
 pyparsing==2.4.6          # via packaging
-pytest==4.6.9             # via -r requirements/tests.in
-readme-renderer==24.0     # via -r requirements/tests.in
+pytest==4.6.9             # via -r requirements/tests.in (line 1)
+readme-renderer==24.0     # via -r requirements/tests.in (line 2)
 six==1.14.0               # via bleach, more-itertools, packaging, pytest, readme-renderer
 wcwidth==0.1.8            # via pytest
 webencodings==0.5.1       # via bleach
-zipp==1.2.0               # via -r requirements/tests.in, importlib-metadata
+zipp==1.2.0               # via -r requirements/tests.in (line 5), importlib-metadata