[2.1.0] Fix plugin path separator on Windows

[jhendersonHDF]

Important

Fixes Windows plugin path separator in CMakeLists.txt to ensure correct path handling.

• Behavior:
  • Fixes plugin path separator for Windows in CMakeLists.txt from : to \;.
  • Ensures correct plugin path handling for Windows testing environment.
• Misc:
  • No changes for Unix/Mac systems.

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