[6.0.0] ec2_vpc_endpoint - remove deprecated `policy_file` parameter

[tremble]

Summary

The policy_file parameter is slated for removal after 2022-12-01, We're now close enough to 2022-12-01 and have only just released 5.0.0, so let's bump the date over to a specific version to make tracking easier.

Issue Type

Feature Idea

Component Name

ec2_vpc_endpoint

Additional Information

Original deprecation: ansible-collections/community.aws#366

Code of Conduct

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[ansibullbot]

Files identified in the description:

• [plugins/modules/ec2_vpc_endpoint.py](https://github.com/['ansible-collections/amazon.aws', 'ansible-collections/community.aws', 'ansible-collections/community.vmware']/blob/main/plugins/modules/ec2_vpc_endpoint.py)

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[ansibullbot]

cc @Etherdaemon @jillr @s-hertel
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