Removed the default config from the action

[joshuaseligman18]

Proposed changes

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The semver-cli by default accepts .github/version.yaml and .github/version.yml. By setting the default config file path in the action to .github/version.yml, we are blocking out the other default filename in the action, which will break users from when they move to this action from uhg-actions/version.

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• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

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