benchpress: add lower bound on uuidm
Failure:
```
#=== ERROR while compiling benchpress.0.1 =====================================#
# context 2.2.0~alpha~dev | linux/x86_64 | ocaml-base-compiler.4.04.2 | pinned(https://github.com/sneeuwballen/benchpress/archive/0.1.tar.gz)
# path ~/.opam/4.04/.opam-switch/build/benchpress.0.1
# command ~/.opam/opam-init/hooks/sandbox.sh build dune build @install -p benchpress -j 255
# exit-code 1
# env-file ~/.opam/log/benchpress-7-aa2d84.env
# output-file ~/.opam/log/benchpress-7-aa2d84.out
### output ###
# ocaml-protoc src/core/api_pb.{ml,mli},src/core/api_pp.{ml,mli},src/core/api_types.{ml,mli}
# Generating ./api_types.mli
# Generating ./api_types.ml
# Generating ./api_pb.mli
# Generating ./api_pb.ml
# Generating ./api_pp.mli
# Generating ./api_pp.ml
# ocamlopt src/core/.benchpress.objs/native/benchpress__Misc.{cmx,o}
# File "_none_", line 1:
# Warning 58: no cmx file was found in path for module ISO8601, and its interface was not compiled with -opaque
# ocamlc src/core/.benchpress.objs/byte/benchpress__Test.{cmi,cmo,cmt} (exit 2)
# (cd _build/default && /home/opam/.opam/4.04/bin/ocamlc.opt -w -40 -warn-error -3-32-34-50 -safe-string -g -bin-annot -I src/core/.benchpress.objs/byte -I /home/opam/.opam/4.04/lib/ISO8601 -I /home/opam/.opam/4.04/lib/bytes -I /home/opam/.opam/4.04/lib/cmdliner -I /home/opam/.opam/4.04/lib/containers -I /home/opam/.opam/4.04/lib/containers/monomorphic -I /home/opam/.opam/4.04/lib/containers/sexp -I /home/opam/.opam/4.04/lib/containers/thread -I /home/opam/.opam/4.04/lib/containers/unix -I /home/opam/.opam/4.04/lib/csv -I /home/opam/.opam/4.04/lib/decoders -I /home/opam/.opam/4.04/lib/gnuplot -I /home/opam/.opam/4.04/lib/iter -I /home/opam/.opam/4.04/lib/logs -I /home/opam/.opam/4.04/lib/ocaml-protoc -I /home/opam/.opam/4.04/lib/ocaml/threads -I /home/opam/.opam/4.04/lib/printbox -I /home/opam/.opam/4.04/lib/re -I /home/opam/.opam/4.04/lib/re/perl -I /home/opam/.opam/4.04/lib/result -I /home/opam/.opam/4.04/lib/seq -I /home/opam/.opam/4.04/lib/sqlite3 -I /home/opam/.opam/4.04/lib/sqlite3_utils -I /home/opam/.opam/4.04/lib/uchar -I /home/opam/.opam/4.04/lib/uuidm -no-alias-deps -open Benchpress -o src/core/.benchpress.objs/byte/benchpress__Test.cmo -c -impl src/core/Test.ml)
# File "src/core/Test.ml", line 538, characters 6-14:
# Error: Unbound value Uuidm.pp
```
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