fix raft build

Summary:
Raft conda packages are built with conda-forge, which ships a newer version of swig, which broke the build. I'm pinning the version as a zero-effort attempt to fix this.

```
[ 80%] Building CXX object CMakeFiles/swigfaiss.dir/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx.o
/home/circleci/miniconda/conda-bld/faiss-pkg_1705881814815/work/_build_python_3.9/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx: In function 'PyObject* swig_ptr(PyObject*)':
/home/circleci/miniconda/conda-bld/faiss-pkg_1705881814815/work/_build_python_3.9/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx:6573:41: error: 'SWIGTYPE_p_unsigned_long_long' was not declared in this scope; did you mean 'SWIGTYPE_p_unsigned_long'?
 6573 |         return SWIG_NewPointerObj(data, SWIGTYPE_p_unsigned_long_long, 0);
      |                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/circleci/miniconda/conda-bld/faiss-pkg_1705881814815/work/_build_python_3.9/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx:1136:94: note: in definition of macro 'SWIG_NewPointerObj'
 1136 | #define SWIG_NewPointerObj(ptr, type, flags)            SWIG_Python_NewPointerObj(NULL, ptr, type, flags)
      |                                                                                              ^~~~
/home/circleci/miniconda/conda-bld/faiss-pkg_1705881814815/work/_build_python_3.9/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx:6580:41: error: 'SWIGTYPE_p_long_long' was not declared in this scope; did you mean 'SWIGTYPE_p_MapLong2Long'?
 6580 |         return SWIG_NewPointerObj(data, SWIGTYPE_p_long_long, 0);
      |                                         ^~~~~~~~~~~~~~~~~~~~
/home/circleci/miniconda/conda-bld/faiss-pkg_1705881814815/work/_build_python_3.9/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx:1136:94: note: in definition of macro 'SWIG_NewPointerObj'
 1136 | #define SWIG_NewPointerObj(ptr, type, flags)            SWIG_Python_NewPointerObj(NULL, ptr, type, flags)
      |                                                                                              ^~~~
make[3]: *** [CMakeFiles/swigfaiss.dir/build.make:76: CMakeFiles/swigfaiss.dir/CMakeFiles/swigfaiss.dir/swigfaissPYTHON_wrap.cxx.o] Error 1
```

Reviewed By: mlomeli1

Differential Revision: D52962236

fbshipit-source-id: e1a6b4c6ba03c9a0a320b5dbb54a8d618b8f8e74

conda/faiss-gpu-raft/meta.yaml

@@ -74,7 +74,7 @@ outputs:
       build:
         - {{ compiler('cxx') }}
         - sysroot_linux-64 =2.17 # [linux64]
-        - swig
+        - swig =4.0.2
         - cmake >=3.23.1
         - make  # [not win]
       host: