Update version to 1.12.2 (#7334)

This PR updates version to 1.12.2 for preparation of a release

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

coremain/version.go

@@ -2,7 +2,7 @@ package coremain
 
 // Various CoreDNS constants.
 const (
-	CoreVersion = "1.12.1"
+	CoreVersion = "1.12.2"
 	CoreName    = "CoreDNS"
 	serverType  = "dns"
 )

notes/coredns-1.12.2.md

@@ -0,0 +1,50 @@
++++
+title = "CoreDNS-1.12.2 Release"
+description = "CoreDNS-1.12.2 Release Notes."
+tags = ["Release", "1.12.2", "Notes"]
+release = "1.12.2"
+date = "2024-05-30T00:00:00+00:00"
+author = "coredns"
++++
+
+This release introduces significant improvements to plugin stability and extensibility.
+It adds multicluster support to the Kubernetes plugin, fallthrough support in the file plugin,
+and a new SetProxyOptions function for the forward plugin.
+Notably, the QUIC (DoQ) plugin now limits concurrent streams, improving performance under load.
+Several bug fixes and optimizations improve reliability across plugins, including rewrite, proxy, and metrics.
+
+## Brought to You By
+
+Ambrose Chua,
+Arthur Outhenin-Chalandre,
+Ben Kochie,
+Colden Cullen,
+Gleb Kogtev,
+Hirotaka Tagawa,
+Kevin Lyda,
+Manuel Rüger,
+Mark Mickan,
+Parfenov Ivan,
+skipper,
+vdbe,
+Viktor Oreshkin,
+Ville Vesilehto,
+Yannick Epstein,
+Yong Tang
+
+
+## Noteworthy Changes
+
+* core: Enable plugins via environment during build (https://github.com/coredns/coredns/pull/7310)
+* core: Ensure DNS query name reset in plugin.NS error path (https://github.com/coredns/coredns/pull/7142)
+* plugin/forward: Added SetProxyOptions function for forward plugin (https://github.com/coredns/coredns/pull/7229)
+* plugin/ready: Do not interrupt querying readiness probes for plugins (https://github.com/coredns/coredns/pull/6975)
+* plugin/secondary: Make transfer property mandatory (https://github.com/coredns/coredns/pull/7249)
+* plugin/rewrite: Truncated upstream response (https://github.com/coredns/coredns/pull/7277)
+* plugin/quic: Limit concurrent DoQ streams and goroutines (https://github.com/coredns/coredns/pull/7296)
+* plugin/kubernetes: Add multicluster support (https://github.com/coredns/coredns/pull/7266)
+* plugin/bind: Remove zone for link-local IPv4 (https://github.com/coredns/coredns/pull/7295)
+* plugin/metrics: Preserve request size from plugins (https://github.com/coredns/coredns/pull/7313)
+* plugin/proxy: Avoid Dial hang after Transport stopped (https://github.com/coredns/coredns/pull/7321)
+* plugin/file: Add fallthrough support (https://github.com/coredns/coredns/pull/7327)
+* plugin/kubernetes: Optimize AutoPath slice allocation (https://github.com/coredns/coredns/pull/7323)