Fix GHA: ubuntu-latest no longer contains Python 3.5 and 3.6

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
-        - ubuntu
+        - ["ubuntu", "ubuntu-20.04"]
         config:
         # [Python version, tox env]
         - ["3.9",   "lint"]
@@ -33,7 +33,7 @@ jobs:
         - ["pypy-3.7", "pypy3"]
         - ["3.9",   "coverage"]
 
-    runs-on: ${{ matrix.os }}-latest
+    runs-on: ${{ matrix.os[1] }}
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     name: ${{ matrix.config[1] }}
     steps:

.meta.toml

@@ -2,14 +2,15 @@
 # https://github.com/zopefoundation/meta/tree/master/config/pure-python
 [meta]
 template = "pure-python"
-commit-id = "3e28a86e311ebffdf17f941c09d8ff646993d837"
+commit-id = "200573eb414d2228d463da3de7d71a6d6335a704"
 
 [python]
 with-future-python = false
 with-legacy-python = true
 with-pypy = true
 with-sphinx-doctests = false
 with-windows = false
+with-macos = false
 
 [coverage]
 fail-under = 88

tox.ini

@@ -42,6 +42,7 @@ deps =
 
 [testenv:isort-apply]
 basepython = python3
+skip_install = true
 commands_pre =
 deps =
     isort
@@ -59,8 +60,8 @@ deps =
 commands =
     mkdir -p {toxinidir}/parts/htmlcov
     coverage run -m zope.testrunner --test-path=src {posargs:-vc}
-    coverage html
-    coverage report -m --fail-under=88
+    coverage html --ignore-errors
+    coverage report --ignore-errors --show-missing --fail-under=88
 
 [coverage:run]
 branch = True