Merge branch 'fupd_step_wp' into 'gen_proofmode'

Slightly weaker WP (i.e., easier to prove), so that we have an fupd where we did not

See merge request FP/iris-coq!153
4 jobs for gen_proofmode in 28 minutes and 39 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #13979
fp
build-coq.8.7.1

00:05:35

passed #13978
fp-timing
build-coq.8.7.2

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passed #13977
fp-timing
build-coq.8.8.0

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passed #13976
fp
build-coq.dev

00:28:36