Pin requirements in CD release workflows

[ml-evs]

It is possible for some tests to fail on CD but not CI; this PR pins the CD workflows to the same requirements file versions.

[codecov]

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[JPBergsma]

Hi ml-evs,

I do not know much about GitHub actions, but as far as I can tell, everything looks ok to me.

[ml-evs]

Hi ml-evs,

I do not know much about GitHub actions, but as far as I can tell, everything looks ok to me.

This is unfortunately something that can only be tested properly by doing a release, I will try one later one and can babysit the workflow