ci: remove redundant single-entry matrix in test-podman-next workflow

[Ankitsinghsisodya]

Summary

• Removes the strategy.matrix block in test-podman-next.yaml which contained only one entry (ubuntu-latest)
• Replaces the indirect runs-on: ${{ matrix.os }} with the direct runs-on: ubuntu-latest
• No behaviour change — simplifies the workflow and makes the intent clearer

Test plan

• Confirm the Func Podman Next Test workflow still triggers on schedule and runs on ubuntu-latest

Fixes #3529

[linux-foundation-easycla]

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• ✅ login: Ankitsinghsisodya / name: Ankit sisodya (16547b9)

[knative-prow]

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[knative-prow]

Hi @Ankitsinghsisodya. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Copilot]

Pull request overview

Simplifies the scheduled “Func Podman Next Test” GitHub Actions workflow by removing an unnecessary single-entry matrix, keeping behavior the same while making the workflow easier to read.

Changes:

• Removes the strategy.matrix block that only contained ubuntu-latest.
• Replaces runs-on: ${{ matrix.os }} with runs-on: ubuntu-latest.

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