Bump boto3 from 1.21.28 to 1.21.32

Bumps [boto3](https://github.com/boto/boto3) from 1.21.28 to 1.21.32.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](boto/boto3@1.21.28...1.21.32)

---
updated-dependencies:
- dependency-name: boto3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

setup.py

@@ -88,7 +88,7 @@ def get_version(version_file):
     # TODO: Loosen these requirements.  See cisagov/guacscanner#9 for
     # more details.
     install_requires=[
-        "boto3 == 1.21.28",
+        "boto3 == 1.21.32",
         "docopt == 0.6.2",
         "ec2-metadata == 2.9.0",
         "psycopg == 3.0.10",