chore(deps): bump delve to 1.26.3 (backport #4930)

[mergify]

ignite chain debug currently prints the following warning with Go 1.25.x:

WARNING: undefined behavior - version of Delve is too old for Go version go1.25.9 (maximum supported version 1.24)

Also, when debugging with VS Code following the Ignite debug guide, breakpoints may not map to the correct source lines.

Bumping Delve to v1.26.3 resolves both issues.

---

This is an automatic backport of pull request #4930 done by Mergify.

[mergify]

Cherry-pick of ab9a4f7 has failed:

On branch mergify/bp/release/v29.x.y/pr-4930
Your branch is up to date with 'origin/release/v29.x.y'.

You are currently cherry-picking commit ab9a4f70.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   go.sum

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally