Fix build failures due to newer MarkUpSafe #5581
Merged
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Fix build errors due to markupsafe 2.1.0 removing soft_unicode, which were breaking the ST2 package tests.
Also, updated the GHA workflow as problems found after requirements.txt was altered. Altered so that it only looks for a cache on exact match of key instead of partial, so that doesn't try and pick up cache from previous version of requirements.txt.