Bump ec2-metadata from 2.9.0 to 2.9.1

Bumps [ec2-metadata](https://github.com/adamchainz/ec2-metadata) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/adamchainz/ec2-metadata/releases)
- [Changelog](https://github.com/adamchainz/ec2-metadata/blob/main/HISTORY.rst)
- [Commits](adamchainz/ec2-metadata@2.9.0...2.9.1)

---
updated-dependencies:
- dependency-name: ec2-metadata
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

setup.py

@@ -90,7 +90,7 @@ def get_version(version_file):
     install_requires=[
         "boto3 == 1.21.28",
         "docopt == 0.6.2",
-        "ec2-metadata == 2.9.0",
+        "ec2-metadata == 2.9.1",
         "psycopg == 3.0.10",
         "schema == 0.7.5",
         "setuptools >= 24.2.0",