build(deps): bump py from 1.9.0 to 1.10.0 in /tests

Bumps [py](https://github.com/pytest-dev/py) from 1.9.0 to 1.10.0.
- [Release notes](https://github.com/pytest-dev/py/releases)
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/py@1.9.0...1.10.0)

Signed-off-by: dependabot[bot] <support@github.com>

tests/requirements.txt

@@ -16,10 +16,6 @@ flask==0.12.5
     # via pytest-flask
 future==0.18.2
     # via radon
-importlib-metadata==3.1.0
-    # via
-    #   pluggy
-    #   pytest
 iniconfig==1.1.1
     # via pytest
 itsdangerous==1.1.0
@@ -34,7 +30,7 @@ packaging==20.4
     # via pytest
 pluggy==0.13.1
     # via pytest
-py==1.9.0
+py==1.10.0
     # via pytest
 pyparsing==2.4.7
     # via packaging
@@ -59,5 +55,3 @@ werkzeug==0.16.1
     # via
     #   flask
     #   pytest-flask
-zipp==3.4.0
-    # via importlib-metadata