docs: Add 1.4.0 release note#493

Merged

jholdstock merged 5 commits intodecred:masterfrom

jholdstock:rel-note-1.4.0

Nov 27, 2025

Commits on Nov 2, 2024

Commits on Jan 8, 2025

Update to decred 2.0.5
jholdstock
committed

Commits on Feb 27, 2025

Update to decred 2.0.6 and go 1.23
jholdstock
committed

Commits on Nov 26, 2025

Update to decred 2.1.0 and go 1.24
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committed