Issue parsing colons on Linux

cfn-lint version: 0.48.2 (cfn-lint --version)

Description of issue.

When I lint this file on my Mac using 0.48.2, I get no errors. When the same file is linted using 0.48.2 in CodeBuild (aws/codebuild/amazonlinux2-x86_64-standard:3.0) it returns:

E0000 found unexpected ':'
./stacks/shared-vpc.yml:38:21

The offending line is: - { Key: prx:meta:tagging-version, Value: "2021-04-07" }

CloudFormation has no issues with the code (it creates those tags as expected). Quoting the values makes the linter happy, even in CodeBuild, but it shouldn’t be necessary, and since the results are inconsistent between platforms it’s hard/annoying to catch them during development. Also it’s a false positive, so it’s mainly just noise during CI.

[kddejong]

Possible references that we need to investigate. We need to start by knowing if it ends up using the Cparser or not and then what version of that library it may be using. https://github.com/yaml/libyaml/pull/28 and https://github.com/yaml/pyyaml/pull/45

[PatMyron]

maybe https://github.com/aws-cloudformation/cfn-python-lint/pull/1992?