Drop after net/miniupnpc >= 2.3.3 update.

-- Checking for module 'miniupnpc>=2.3.3'
--   Package dependency requirement 'miniupnpc >= 2.3.3' could not be satisfied.
Package 'miniupnpc' has version '2.3.2', required version is '>= 2.3.3'
CMake Error at /usr/local/share/cmake/Modules/FindPkgConfig.cmake:645 (message):
  The following required packages were not found:

   - miniupnpc>=2.3.3

--- 3rdparty/miniupnp/CMakeLists.txt.orig	2025-09-30 21:49:18 UTC
+++ 3rdparty/miniupnp/CMakeLists.txt
@@ -1,6 +1,6 @@ if(USE_SYSTEM_MINIUPNPC)
 if(USE_SYSTEM_MINIUPNPC)
   message(STATUS "RPCS3: using shared MiniUPnPc")
-  pkg_check_modules(MiniUPnPc REQUIRED IMPORTED_TARGET miniupnpc>=2.3.3)
+  pkg_check_modules(MiniUPnPc REQUIRED IMPORTED_TARGET miniupnpc)
   add_library(3rdparty_miniupnpc INTERFACE)
   target_link_libraries(3rdparty_miniupnpc INTERFACE PkgConfig::MiniUPnPc)
   target_include_directories(3rdparty_miniupnpc INTERFACE PkgConfig::MiniUPnPc)