CI: Drag forward more constraints
Previously, we'd install the lowest (mostly common) denominator of deps for our func-py3 jobs. This left us not testing up-to-date deps for many python versions, though, and could even prevent us from testing on new python versions entirely. For example, py312 cannot install greenlet 2.0.2, the last version to support py36; this caused gate failures when OpenStack as a whole tried to run Swift's func tests on Ubuntu 24.04. Change-Id: I0e55d8b4c5ed520c0aad8cc952a9fa1683905356
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