docs: Update dev/release/README.md for new crate datafusion-proto-models (#24472)

## Which issue does this PR close?

- Follow on to #22393

## Rationale for this change

A new crate was added, `datafusion-proto-models` that needs to be
published

## What changes are included in this PR?

Update publishing instructions

## Are these changes tested?

I tested them manually

## Are there any user-facing changes?

No

Author: alamb

dev/release/README.md

@@ -318,6 +318,7 @@ Verify that the Cargo.toml in the tarball contains the correct version
 (cd datafusion/expr-common && cargo publish)
 (cd datafusion/macros && cargo publish)
 (cd datafusion/proto-common && cargo publish)
+(cd datafusion/proto-models && cargo publish)
 (cd datafusion/physical-expr-common && cargo publish)
 (cd datafusion/functions-aggregate-common && cargo publish)
 (cd datafusion/functions-window-common && cargo publish)