go: Add CVE-2026-26014 temporarily to .nancy-ignore

Author: kostko

go/.nancy-ignore

@@ -2,3 +2,4 @@ CVE-2024-34478 # can be ignored as we only use a few crypto libraries from btcd
 CVE-2025-4673 until=2025-07-14  # no mitigation is currently available (2025-06-14)
 CVE-2021-43668 # the vulnerability does not affect us as we don't use LevelDB
 CVE-2025-11065 until=2025-12-01 # the vulnerability does not affect us
+CVE-2026-26014 until=2026-03-01 # requires upstream mitigation