What this PR does:

• Fixes TCPTransportConfig getting overridden in the ring/example/local example code

Which issue(s) this PR fixes:

none

Checklist

• Tests updated
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

For context I was trying to use the ring example and was having issues with the following log messages:

Refuting a suspect message (from: 127.0.0.1-7a3fd3a1)
Suspect 127.0.0.1-7a3fd3a1 has failed, no acks received

Enabling debug logs showed some more juicy info:

level=debug component=memberlist component="memberlist TCPTransport" msg="WriteTo failed to acquire a writer. Dropping message" timeout=0s addr=127.0.0.1:7947
level=debug component=memberlist component="memberlist TCPTransport" msg="WriteTo failed to acquire a writer. Dropping message" timeout=0s addr=127.0.0.1:7947
level=debug component=memberlist component="memberlist TCPTransport" msg="WriteTo failed to acquire a writer. Dropping message" timeout=0s addr=127.0.0.1:7947

The weird thing is that this only occurred on Go 1.23.0+. The example still specifies 1.22.0 where the bug was not present. To reproduce just change the Go version:

diff --git a/ring/example/local/go.mod b/ring/example/local/go.mod
index b72cd79..2d62f84 100644
--- a/ring/example/local/go.mod
+++ b/ring/example/local/go.mod
@@ -1,6 +1,6 @@
 module github.com/grafana/dskit/ring/example/local

-go 1.22.0
+go 1.23.0

 toolchain go1.24.2

The errornous example set the timeout (TCPTransportConfig.AcquireWriterTimeout) to write a broadcast message to zero, which behaved differently between Go 1.22 and 1.23.

But now the example doesn't override the example anymore and works in both 1.22 and later.