CI: resurect workflows

[dveeden]

What problem does this PR solve?

• Upgrade from Ubuntu 20.04 to Ubuntu Latest as 20.04 is no longer available.
• Upgrade actions
• Use Go version from go.mod instead of hardcoding it.

What is changed and how it works?

Check List

Tests

• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

None

Tests

https://github.com/dveeden/tiflow/actions/runs/23583701374/job/68671780340

This is only for one of the updated workflows.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[dveeden]

/cc @OliverS929 @lance6716

[dveeden]

/label skip-issue-check

[ti-chi-bot]

@dveeden: The label(s) skip-issue-check cannot be applied. These labels are supported: MariaDB, affects-7.1, affects-7.5, affects-8.1, affects-8.5, bug-from-internal-test, bug-from-user, duplicate, may-affects-7.1, may-affects-7.5, may-affects-8.1, may-affects-8.5, needs-cherry-pick-release-6.5, needs-cherry-pick-release-7.1, needs-cherry-pick-release-7.5, needs-cherry-pick-release-8.1, needs-cherry-pick-release-8.5, needs-cherry-pick-release-9.0-beta.2, nextgen, question, release-blocker, wontfix.

Details

In response to this:

/label skip-issue-check

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[dveeden]

/skip-issue-check

[dveeden]

/cc @wuhuizuo

[lance6716]

please paste the green github actions link to PR description

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [lance6716]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-03-26 08:41:28.305049818 +0000 UTC m=+430484.341120079: ☑️ agreed by lance6716.

[ti-chi-bot]

[FORMAT CHECKER NOTIFICATION]

Notice: To remove the do-not-merge/needs-linked-issue label, please provide the linked issue number on one line in the PR body, for example: Issue Number: close #123 or Issue Number: ref #456.

_{📖 For more info, you can check the "Contribute Code" section in the development guide.}

[dveeden]

/retest