Add v3.2.1 release notes to CHANGELOG

**Why?**

Since the v3.2.1 release is on a separate release branch, this change will
port back the release notes into the CHANGELOG.md file.

Additionally, the v3.2.1 release includes a minor patch to the account
processing requirements file. Where it specifies the exact boto3 and botocore
dependencies to ensure it continues to function, even in the event of updates
to the Lambda Python runtime in the future.

CHANGELOG.md

@@ -183,6 +183,58 @@ GitLab](./docs/admin-guide.md#using-aws-codeconnections-for-bitbucket-github-or-
 
 ---
 
+## v3.2.1
+
+The upcoming v4 release will introduce breaking changes. As always, it is
+recommended to thoroughly review and test the upgrade procedure in a
+non-production environment.
+
+Unfortunately, a few issues popped up in ADF v3.2.0 that block a clean
+installation in a new environment. Making it harder to test the upgrade
+process. This release resolves those issues and includes an updated installer
+for ADF to simplify installation.
+
+We hope this shortens the time required to prepare for the v4 upgrade.
+
+---
+
+### Fixes
+
+* Fix management account config alias through ADF account management (#596) by
+  @sbkok.
+* Fix CodeBuild stage naming bug (#628) by @pozeus, resolves #627.
+* Fix Jinja2 template rendering with autoescape enabled (#690) by @sujay0412.
+* Fix missing deployment_account_id and initial deployment global IAM bootstrap
+  (#686) by @sbkok, resolves #594 and #659.
+* Fix permissions to enable delete default VPC in management account (#699) by
+  @sbkok.
+* Fix tagging of Cross Account Access role in the management account (#700) by
+  @sbkok.
+* Fix CloudFormation cross-region changeset approval (#701) by @sbkok.
+* Fix clean bootstrap of the deployment account (#703) by @sbkok, resolves #696.
+* Bump Jinja2 from 3.1.3 to 3.1.4 (#720 and #721) by @dependabot.
+* Fix account management lambdas in v3.2 (#729) by @sbkok.
+
+---
+
+### Installation enhancements
+
+This release is the first release with the new installation process baked in.
+Please read the [Installation Guide](https://github.com/awslabs/aws-deployment-framework/blob/make/latest/docs/installation-guide.md)
+how to install ADF. In case you are upgrading, please follow [the admin guide
+on updating ADF](https://github.com/awslabs/aws-deployment-framework/blob/make/latest/docs/admin-guide.md#updating-between-versions)
+instead.
+
+Changes baked into this release to support the new installation process:
+
+* New install process (#677) by @sbkok.
+* Install: Add checks to ensure installer dependencies are available (#702) by
+  @sbkok.
+* Install: Add version checks and pre-deploy warnings (#726) by @sbkok.
+* Ensure tox fails at first pytest failure (#686) by @sbkok.
+
+---
+
 ## v3.2.0
 
 __Please note__: this update refactored the account creation and pipeline

src/lambda_codebase/account_processing/requirements.txt

@@ -1,3 +1,5 @@
 aws-xray-sdk==2.13.0
+boto3==1.34.80
+botocore==1.34.80
 pyyaml~=6.0.1
 tenacity==8.2.3