linux-pipewire: Restore PipeWire minimim version requirement

https://github.com/obsproject/obs-studio/commit/a147315f33edc59c165f8cda1120d6d4219cf6ee removed it without adding it to linux-pipewire.

plugins/linux-pipewire/CMakeLists.txt

@@ -6,7 +6,7 @@ if(NOT ENABLE_PIPEWIRE)
   return()
 endif()
 
-find_package(PipeWire REQUIRED)
+find_package(PipeWire 0.3.32 REQUIRED)
 find_package(Gio QUIET)
 find_package(Libdrm QUIET) # we require libdrm/drm_fourcc.h to build