Bump ec2-metadata from 2.2.0 to 2.3.0

Bumps [ec2-metadata](https://github.com/adamchainz/ec2-metadata) from 2.2.0 to 2.3.0.
- [Release notes](https://github.com/adamchainz/ec2-metadata/releases)
- [Changelog](https://github.com/adamchainz/ec2-metadata/blob/master/HISTORY.rst)
- [Commits](adamchainz/ec2-metadata@2.2.0...2.3.0)

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

requirements.txt

@@ -10,7 +10,7 @@ cornice==5.0.3
 cornice-swagger==1.0.0
 cryptography==3.3.1
 dockerflow==2020.10.0
-ec2_metadata==2.2.0
+ec2_metadata==2.3.0
 hawkauthlib==2.0.0
 hupper==1.10.2
 idna==2.10