Update setuptools for python 3.5 tests (#6880)

Workaround for jaraco/zipp#40
matrix-org · Feb 10, 2020 · fe73f0d · fe73f0d
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diff --git a/.buildkite/scripts/test_old_deps.sh b/.buildkite/scripts/test_old_deps.sh
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+#!/bin/bash
+
+# this script is run by buildkite in a plain `xenial` container; it installs the
+# minimal requirements for tox and hands over to the py35-old tox environment.
+
+set -ex
+
+apt-get update
+apt-get install -y python3.5 python3.5-dev python3-pip libxml2-dev libxslt-dev zlib1g-dev
+
+# workaround for https://github.com/jaraco/zipp/issues/40
+python3.5 -m pip install 'setuptools>=34.4.0'
+
+python3.5 -m pip install tox
+
+export LANG="C.UTF-8"
+
+exec tox -e py35-old,combine
diff --git a/changelog.d/6880.misc b/changelog.d/6880.misc
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+Fix continuous integration failures with old versions of `pip`, which were introduced by a release of the `zipp` library.
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		Fix continuous integration failures with old versions of `pip`, which were introduced by a release of the `zipp` library.