tox.ini: bump pyflakes version to 2.2.0

pyflakes versions older than 2.1.0 are incompatible with Python 3.8 (which is the Python version in the Focal release). See PyCQA/pyflakes#367 for details. 2.2.0 is the latest version ATM, so bump to that. Fixes: canonical#1023
blackboxsw · Apr 22, 2020 · 0015626 · 0015626
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diff --git a/tools/constraints-bionic.txt b/tools/constraints-bionic.txt
@@ -2,6 +2,7 @@ attrs==17.4
 flake8==3.5.0
 py==1.5.2
 pycodestyle==2.3.1
+pyflakes==2.2.0
 pytest==3.3.2
 pytest-cov==2.5.1
 pyyaml==3.12
diff --git a/tools/constraints-xenial.txt b/tools/constraints-xenial.txt
@@ -2,6 +2,7 @@ attrs==15.2
 flake8==2.5.4
 pep8==1.7.0
 py==1.4.31
+pyflakes==2.2.0
 pytest==2.8.7
 pytest-cov==2.2.1
 pyyaml==3.11