Add Savannah as jit.yml CODEOWNER (#145152)

Add Savannah for jit.yml CODEOWNER

(cherry picked from commit 6180e79)

Author: savannahostrowski

.github/CODEOWNERS

@@ -6,6 +6,7 @@
 
 # GitHub
 .github/**                    @ezio-melotti @hugovk @AA-Turner @webknjaz
+.github/workflows/jit.yml     @savannahostrowski
 Tools/build/compute-changes.py              @AA-Turner @hugovk @webknjaz
 Lib/test/test_tools/test_compute_changes.py @AA-Turner @hugovk @webknjaz
 
@@ -351,4 +352,4 @@ Modules/_xxtestfuzz/          @ammaraskar
 # Remote debugging
 Python/remote_debug.h         @pablogsal
 Python/remote_debugging.c     @pablogsal
-Modules/_remote_debugging_module.c @pablogsal @ambv @1st1
+Modules/_remote_debugging_module.c @pablogsal @ambv @1st1