Updating changelog

[aaronjeline]

Description of changes

Updates changelog for upcoming 3.2.2

Issue #, if available

N/A

Checklist for requesting a review

The change in this PR is (choose one, and delete the other options):

• [X] A change "invisible" to users (e.g., documentation, changes to "internal" crates like cedar-policy-core, cedar-validator, etc.)

I confirm that cedar-spec (choose one, and delete the other options):

• [X] Does not require updates because my change does not impact the Cedar formal model or DRT infrastructure.

[cdisselkoen]

I think we should name the next patch release 3.2.4, due to the snafu where we had to release 3.2.2 and 3.2.3 as npm-only. Naming it 3.2.4 will get the crates.io and npm version numbers back in sync.

[khieta]

Updated in preparation for the upcoming release. Needs re-review.