hdPrmanXpuLoader: Fix link issues on Linux and macOS

The hdPrmanXpuLoader plugin currently links against hdPrmanLoader,
which is also a plugin. However, the build system assumes that
plugins are leaf libraries with no dependents and does not set
up an RPATH entry pointing to the plugin install directory.
This leads to an error when trying to switch to RenderMan XPU
in usdview: loading hdPrmanXpuLoader fails because it can't
find its hdPrmanLoader dependency at runtime.

This fix works around the issue by forcing the addition of the
plugin install directory to hdPrmanXpuLoader's RPATH. This is
intended to be a short term patch while we explore other ways
to structure these loader plugins.

(Internal change: 2372879)

CHANGELOG: Update for 25.05.01 release

(Internal change: 2367452)

Merge release v25.05

Update BuildUSD action to use upload-artifacts@v4 on Windows

upload-artifacts@v3 had previously been deprecated and was
disabled as of January 30th per:

https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/

The bug that prevented us from using v4 earlier on Windows
appears to have been fixed.

(Internal change: 2355870)

Merge release v25.02

Version 25.02-rc1

Merge release v24.11

Version 24.11-rc1

Merge release v24.08

Version 24.08-rc1