Bump py from 1.8.0 to 1.11.0 in /ci

Bumps [py](https://github.com/pytest-dev/py) from 1.8.0 to 1.11.0.
- [Changelog](https://github.com/pytest-dev/py/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/py@1.8.0...1.11.0)

---
updated-dependencies:
- dependency-name: py
  dependency-type: direct:production
...

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

ci/requirements-tests.txt

@@ -4,27 +4,51 @@
 #
 #    pip-compile --output-file ci/requirements-tests.txt setup.py ci/requirements-tests.in
 #
-apipkg==1.5               # via execnet
-atomicwrites==1.3.0       # via pytest
+apipkg==1.5
+    # via execnet
+atomicwrites==1.3.0
+    # via pytest
 attrs==19.1.0
-cffi==1.12.2
-coverage==4.5.3           # via pytest-cov
-execnet==1.5.0            # via pytest-cache
-future==0.18.3
-mccabe==0.6.1             # via pytest-mccabe
-more-itertools==5.0.0     # via pytest
-numpy==1.16.2
-pep8==1.7.1               # via pytest-pep8
-pluggy==0.9.0             # via pytest
-py==1.8.0                 # via pytest
-pycparser==2.19           # via cffi
-pyflakes==2.1.1           # via pytest-flakes
-pytest-cache==1.0         # via pytest-mccabe, pytest-pep8
+    # via pytest
+coverage==4.5.3
+    # via pytest-cov
+execnet==1.5.0
+    # via pytest-cache
+mccabe==0.6.1
+    # via pytest-mccabe
+more-itertools==5.0.0
+    # via pytest
+pep8==1.7.1
+    # via pytest-pep8
+pluggy==0.9.0
+    # via pytest
+py==1.11.0
+    # via pytest
+pyflakes==2.1.1
+    # via pytest-flakes
+pytest==4.3.1
+    # via
+    #   -r requirements-tests.in
+    #   pytest-cache
+    #   pytest-cov
+    #   pytest-flakes
+    #   pytest-mccabe
+    #   pytest-pep8
+pytest-cache==1.0
+    # via
+    #   pytest-mccabe
+    #   pytest-pep8
 pytest-cov==2.6.1
+    # via -r requirements-tests.in
 pytest-flakes==4.0.0
+    # via -r requirements-tests.in
 pytest-mccabe==0.1
+    # via -r requirements-tests.in
 pytest-pep8==1.0.6
+    # via -r requirements-tests.in
 pytest-runner==4.4
-pytest==4.3.1
-six==1.12.0               # via pytest
-typing==3.6.6
+    # via -r requirements-tests.in
+six==1.12.0
+    # via
+    #   more-itertools
+    #   pytest