Update release note of 1.14.6 (#8269)

This PR update release note of 1.14.6, part of 8228

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

notes/coredns-1.14.6.md

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++++
+title = "CoreDNS-1.14.6 Release"
+description = "CoreDNS-1.14.6 Release Notes."
+tags = ["Release", "1.14.6", "Notes"]
+release = "1.14.6"
+date = "2026-07-10T00:00:00+00:00"
+author = "coredns"
++++
+
+This patch release focuses on fixing ARM and MIPS build issues introduced in
+v1.14.5 by downgrading the dd-trace-go dependency, while also including
+improvements to forwarding and secondary zone support.
+
+## Brought to You By
+
+Filippo125
+houyuwushang
+Immanuel Tikhonov
+Ville Vesilehto
+Yong Tang
+
+## Noteworthy Changes
+
+core: Downgrade dd-trace-go to v2.8.2 (https://github.com/coredns/coredns/pull/8266)
+plugin/auto: Keep first matching zone file for duplicate origins (https://github.com/coredns/coredns/pull/8216)
+plugin/forward: Add source_address directive (https://github.com/coredns/coredns/pull/8011)
+plugin/secondary: Serve catalog member zones (https://github.com/coredns/coredns/pull/8230)