Return the changelog to development status.

Alias replacements derived from syntax were introduced in #220 as a way
to ensure the aliases used in source code were also used. This helped
ensure packages mode worked on go1.22, which didn't have explicit alias
node support in the `go/types` package.

Alias replacements have a couple issues:
* They flat out replace any would-be references to an underlying type
with an alias type.
* They don't properly handle aliases to generic type instantiations
(ref: #243)

Now that go1.24 is released, we can bump `go.mod` to go1.23, which means
we can ensure `go/types` has an explicit `types.Alias` node for type
aliases, and we can remove the alias replacement logic.

Prepare the changelog for a v0.5.2 release containing a bug fix caused
by outdated go version and alias replacements logic.