chore: remove hardcoded python runtime in prerelease presubmit (#14607)

Remove hardcoded python runtime for the prerelease presubmit to resolve
the failure in
#14606 where we
want to run prerelease tests with python 3.14

Author: parthea

ci/run_single_test.sh

@@ -61,7 +61,7 @@ case ${TEST_TYPE} in
         rm -rf docs/_build
         ;;
     prerelease)
-        nox -s prerelease_deps-3.13
+        nox -s prerelease_deps
         retval=$?
         ;;
     unit)