Normalize the amazon-ecs-cni-plugins package Version

[ginglis13]

What I'd like:

The amazon-ecs-cni-plugins package uses a git rev as Version in its spec:

bottlerocket-core-kit/packages/amazon-ecs-cni-plugins/amazon-ecs-cni-plugins.spec

Lines 4 to 7 in 20d23ef

	%global ecscni_gitrev 53a8481891251e66e35847554d52a13fc7c4fd03
	Name: %{_cross_os}amazon-ecs-cni-plugins
	Version: %{ecscni_gitrev}

With changes to application inventory generation in bottlerocket-os/twoliter#384, packages ideally will use a more easily comparable versioning.

Use https://github.com/aws/amazon-ecs-cni-plugins/blob/master/VERSION for the package's version (which is 2024.09.0 as of writing)

Bump its Epoch to 1 along with this change.