Plan to release v3.6.14

[ivanvc]

What would you like to be added?

The etcd patch release criteria has been met for our release-3.6 stable branch, so we should release v3.6.14.

Work in progress CHANGELOG is: https://github.com/etcd-io/etcd/blob/main/CHANGELOG/CHANGELOG-3.6.md#

The list of commits included since the previous release is: v3.6.13...release-3.6:

• [release-3.6] dependency: bump golang.org/x/net from 0.54.0 to 0.55.0 #22030
• [release-3.6] Bump Go to 1.25.12 #22060
• [release-3.6] Fix unsynchronized range over leaseCache.entries #22150
• [release-3.6] deps: bump google.golang.org/grpc to 1.82.1 #22155
• [release-3.6] Set a 5-minutes ReadHeaderTimeout for client http.Server #22144
• [release-3.6] Fix unbounded io.ReadAll on peer lease HTTP handler body #22148
• [release-3.6] Set a reasonable value for snapshotLimitByte #22146
• [release-3.6] Set a tlsHandshakeTimeout for tlsListener #22142
• [release-3.6] Fix the costTxnReq ignores nested RequestTxn issue #22140

Outstanding tasks before releasing this version:

• TBD

Release team

GitHub handle	Role
@ivanvc	Release Lead

Why is this needed?

Regular patch releases are vital to ensure our users have bug-free and secure software.