Fix: get_version.go returns wrong version when multiple entries exist

[Caesarsage]

Fixes #21970

The get_version.go tool was using FindSubmatch which returns only the
first match. When go.mod contains multiple versions of the same
dependency (e.g., v74 and v79 for go-github), it would always return
the first (older) version.

This caused automated update PRs to show incorrect titles like:
'CI: update go-github from v74.0.0 to v74.0.0'

[k8s-ci-robot]

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[minikube-bot]

Can one of the admins verify this patch?

[k8s-ci-robot]

@Caesarsage: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
integration-kvm-containerd-linux-x86-64	f16e986	link	true	/test integration-kvm-containerd-linux-x86-64
integration-kvm-crio-linux-x86-64	f16e986	link	true	/test integration-kvm-crio-linux-x86-64
integration-none-docker-linux-x86-64	f16e986	link	true	/test integration-none-docker-linux-x86-64
integration-docker-containerd-linux-x86-64	f16e986	link	true	/test integration-docker-containerd-linux-x86-64
integration-docker-crio-linux-x86-64	f16e986	link	true	/test integration-docker-crio-linux-x86-64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[medyagh]

@Caesarsage can you plz post an example of running the code with getting version of something with multiple

[Caesarsage]

@Caesarsage can you plz post an example of running the code with getting version of something with multiple

Hello @medyagh

Here's the exampl showing the fix working with multiple versions:

Test Scenario

Using the current go.mod with multiple go-github entries:

github.com/google/go-github/v74 v74.0.0
github.com/google/go-github/v79 v79.0.0  // new as a result of `make update-go-github-version`:

Before Fix (using FindSubmatch)

The original code uses FindSubmatch() which returns only the first match (even after the automation runs make update-go-github-version):

$ DEP=go-github make get-dependency-version
v74.0.0  # Returns the FIRST/OLD version

After Fix (using FindAllSubmatch)

The fixed code uses FindAllSubmatch() and takes the last match, which is what is needed after the automation runs make update-go-github-version:

$ DEP=go-github make get-dependency-version
v79.0.0  # Returns the LAST/CURRENT version

When the automated workflow runs for futture reference on new versions:

1. OLD_VERSION captures the current version → v79.0.0
2. make update-go-github-version runs and updates to new version → v80.0.0
3. NEW_VERSION captures the updated version → v80.0.0