Fixes # .

Summary/Motivation:

The Xpress 9.5.1 release through the fico-xpress conda channel hangs when calling xpress.init() -- but only on Python 3.10 and 3.11 / Windows GHA. (Quick) attempts to reproduce this locally were not successful, so it is unclear if this is a GHA issue, Conda issue, an Xpress issue, or an issue with our configuration of the build environment.

@djunglas, is there a good way to report things like this upstream?

This PR gets the Pyomo testing infrastructure "working" again by simply pinning xpress to 9.5.0 under Conda on Windows for Python 3.10 and 3.11. I attempted to make the version pin "float" (and automatically pick up any future Xpress releases), but that was not successful (see comments in the workflows). We should monitor upstream and revisit if this is still needed after the next Xpress release.

Changes proposed in this PR:

• Pin xpress to 9.5.0 on Windows under conda for Python 3.10 and 3.11 (only)
• Do some minor clean up of the GHA drivers

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