Use last version compatible with Python 3.4/3.5

See deprecation warning for these python versions https://aws.amazon.com/blogs/developer/announcing-the-end-of-support-for-python-3-4-and-3-5-in-the-aws-sdk-for-python-and-aws-cli-v1/

> On February 1, 2021, the AWS SDK for Python (Boto3 and Botocore) and the AWS Command Line Interface (AWS CLI) v1 will no longer support Python 3.4 and Python 3.5. We encourage you to upgrade to Python 3.6 or later (this deprecation doesn’t affect customers using Python 2.7).

Issue - our version of pip installs the awscli package even though it now depends on an rsa package version that doesn't run in Python 3.5 Charming

> [awscli v1.19.15 adjusted] our dependencies for rsa. We've moved our range to versions that no longer support Python 3.5. The AWS CLI did a deprecation campaign last year for dropping support of 3.4/3.5 at the beginning of Feb 2021.
>
> What's interesting is modern versions of pip for the last several years prevent what's happening here by refusing to install awscli-1.19.0+ on Python 3.5. Do you know offhand what version of pip your environment is using?
>
> In the meantime, we'd encourage you to either migrate to the AWS CLI v2, Python 3.6+, or pin to awscli<1.19.

roles/aws-tools/tasks/install-pip-aws-cli-Debian.yml

@@ -3,4 +3,4 @@
   apt: name=python3-pip state=present
 
 - name: Install latest AWS CLI
-  command: pip3 install awscli
+  command: pip3 install -I awscli==1.19.12