Add Savannah to CODEOWNERS for argparse and the JIT (python#126814)

Add Savannah to CODEOWNERS

Author: savannahostrowski

.github/CODEOWNERS

@@ -16,14 +16,17 @@ configure*                    @erlend-aasland @corona10
 Makefile.pre.in               @erlend-aasland
 Modules/Setup*                @erlend-aasland
 
+# argparse
+**/*argparse*                 @savannahostrowski
+
 # asyncio
 **/*asyncio*                  @1st1 @asvetlov @kumaraditya303 @willingc
 
 # Core
 **/*context*                  @1st1
 **/*genobject*                @markshannon
 **/*hamt*                     @1st1
-**/*jit*                      @brandtbucher
+**/*jit*                      @brandtbucher @savannahostrowski
 Objects/set*                  @rhettinger
 Objects/dict*                 @methane @markshannon
 Objects/typevarobject.c       @JelleZijlstra