Add minivpt lower bounds

[jmid]

In #24677 there are lower bound failures in lower bound dependency... 😅
This causes:

#=== ERROR while compiling minivpt.2.0.0 ======================================#
# context              2.2.0~alpha3~dev | linux/x86_64 | ocaml-base-compiler.4.03.0 | file:///home/opam/opam-repository
# path                 ~/.opam/4.03/.opam-switch/build/minivpt.2.0.0
# command              ~/.opam/opam-init/hooks/sandbox.sh build obuild build lib-minivpt
# exit-code            2
# env-file             ~/.opam/log/minivpt-7-cd9550.env
# output-file          ~/.opam/log/minivpt-7-cd9550.out
### output ###
# uncaught exception
# Fatal error: exception Failure("unknown option: lib-minivpt")

After having checked locally, this PR therefore adds a lower bound requirement of obuild.0.0.3

[jmid]

CI showed

• lbvs_consent failures (expected - and to be fixed by Patch lbvs_consent 2.1.1-2.2.0 to support openbabel-3 #24677)
• s390x failures with No space left of device

I've therefore restarted the failing jobs,

[jmid]

Still seeing
s390x-ocaml-4.14 minivpt.1.0.0 (failed: Failed: Build failed)
with the message
fatal: cannot create directory at 'packages/camyll/camyll.0.3.0': No space left on device

[mseri]

That’s a ci issue, don’t worry about it. Thanks for the fix

[mseri]

Minivpt now builds fine, thanks