CompatHelper: bump compat for ITensorMPS to 0.4 for package test, (keep existing compat) (#21)

## Summary

Bumps compat for ITensorMPS to 0.4 in ``test/Project.toml``. ITensorMPS
is a test-only dependency in this repo.

Also bumps the package version 0.1.7 → 0.1.8 to satisfy ``VersionCheck``
(subdir Project.toml changes are classified as substantive).

Rebased onto current ``main``.

> Note: ``CheckCompatBounds`` blocks on ITensorVisualizationBase 0.1.18
being registered first (root depends on ITensorVisualizationBase, which
only adds ITensorMPS 0.4 compat in 0.1.18). Once
ITensorVisualizationBase 0.1.18 lands and registers, this PR's CI should
pass.

## Test plan

- [ ] CI green (gated on ITensorVisualizationBase 0.1.18 registration)

---------

Co-authored-by: CompatHelper Julia <compathelper_noreply@julialang.org>
Co-authored-by: Matthew Fishman <mfishman@flatironinstitute.org>

Author: 3 people

Project.toml

@@ -1,6 +1,6 @@
 name = "ITensorUnicodePlots"
 uuid = "73163f41-4a9e-479f-8353-73bf94dbd758"
-version = "0.1.7"
+version = "0.1.8"
 authors = ["Matthew Fishman <mfishman@flatironinstitute.org> and contributors"]
 
 [workspace]

test/Project.toml

@@ -18,7 +18,7 @@ path = ".."
 Aqua = "0.8.9"
 GeometryBasics = "0.4.1, 0.5"
 Graphs = "1.4.1"
-ITensorMPS = "0.3"
+ITensorMPS = "0.3, 0.4"
 ITensorPkgSkeleton = "0.3.42"
 ITensorUnicodePlots = "0.1"
 ITensors = "0.7, 0.8, 0.9"