Pin to importlib-metadata==4.13.0, because it's not supported in Python3.7 - Tests are failing

Although it's in the requirements-dev.txt it's not used in flake8, bandit or doc8

Signed-off-by: Martyn <martyn.bristow@thermofisher.com>

Author: martyn-bristow

tox.ini

@@ -3,7 +3,6 @@ linting_targets = atlassian/ examples/ tests/
 
 [tox]
 envlist = py3,flake8,black,mypy,bandit,doc8
-skip_missing_interpreters = True
 
 [testenv]
 deps =
@@ -21,7 +20,8 @@ parallel_show_output = true
 [testenv:flake8]
 basepython = python3
 skip_install = true
-deps = 
+deps =
+    importlib-metadata==4.13.0
     flake8
     flake8-no-fstring
 commands = flake8 {[base]linting_targets}
@@ -47,13 +47,16 @@ commands = mypy atlassian/
 [testenv:bandit]
 basepython = python3
 skip_install = true
-deps = bandit
+deps =
+    importlib-metadata==4.13.0
+    bandit
 commands = bandit -r atlassian/
 
 [testenv:doc8]
 basepython = python3
 skip_install = true
 deps =
+    importlib-metadata==4.13.0
     sphinx
     doc8
 commands = doc8 --ignore-path docs/_build/ docs/