Remove unused but annotated `out` from `OpExProcessor.process_bsym` #5978

Job	Run time
check-schema / schema	14s
check-package / pkg-build (ubuntu-latest)	19s
precommit-run / pre-commit	1m 12s
check-package / merge-artifacts	13s
check-package / pkg-check (ubuntu-latest, 3.10)	2m 48s
check-package / pkg-check (ubuntu-latest, 3.11)	2m 39s
check-package / pkg-check (macOS-latest, 3.10)	1m 12s
check-package / pkg-check (macOS-latest, 3.11)	1m 1s
check-package / pkg-check (windows-latest, 3.10)	4m 20s
check-package / pkg-check (windows-latest, 3.11)	4m 43s
check-package / pkg-guardian	1s
	18m 42s

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