configtls/README.md gives wrong default max TLS version

[pureklkl]

Describe the bug
The default max TLS version in readme is 1.3 but looking at the code
https://github.com/open-telemetry/opentelemetry-collector/blob/main/config/configtls/configtls.go#L183
which called method convertVersion at
https://github.com/open-telemetry/opentelemetry-collector/blob/main/config/configtls/configtls.go#L242
It gives default to be 1.2.

Steps to reproduce
If you let max_version be empty and try to talk to the collector with TLSv1.3, you will see
client offered only unsupported versions: [304]

What did you expect to see?
The default max version should be tls1.3.

What did you see instead?
The default max version is tls1.2.

What version did you use?
v0.52.0

What config did you use?
Config: (e.g. the yaml config file)

Environment
otel/opentelemetry-collector-contrib docker image

Additional context