af_unix: Set gc_in_progress to true in unix_gc().

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-53361 · Microsoft / collected KEV context

cve-program · CVE-2026-53361

• https://git.kernel.org/stable/c/20aa894d475bd8086b25c1113ec4ca70f70c7a98
• https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0
• https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a
• https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082
• https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af

No related operational record is retained in the current change model.