Changing the semantic version stops dependabot package updates

[angold5]

Is there an existing issue for this?

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Package ecosystem

github-action

Package manager version

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Language version

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dependabot.yml content

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Updated dependency

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What you expected to see, versus what you actually saw

I have developed a github action and for updates to it I have used the git tags (versioning) was as follows:
v1.1
v2.1
v2.5

I decided to move to full semantic versioning and now Dependabot no longer sees the new updates.
new versioning starts at v2.6.1.

so my versioning is:
v1.1
v2.1
v2.5 <- dependabot says this is the latest version
v2.6.1

Native package manager behavior

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Smallest manifest that reproduces the issue

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