chore: automated update of go and dependencies

[github-actions]

Summary

This PR updates Go and all project dependencies to their latest versions as part of automated maintenance:

• Go version updated from 1.26.0 to 1.26.3 in:
  • go.mod
  • Dockerfile
• Updated Go dependencies including:
  • github.com/digitalocean/godo v1.188.0 → v1.191.0
  • k8s.io/api v0.36.0 → v0.36.1
  • k8s.io/apimachinery v0.36.0 → v0.36.1
  • k8s.io/client-go v0.36.0 → v0.36.1
  • sigs.k8s.io/controller-runtime v0.24.0 → v0.24.1
  • Various other dependency updates

All changes were generated by following the "Update Go and dependencies" instructions in the README:

1. Updated Go versions in configuration files
2. Ran go get -u ./...
3. Ran go mod tidy
4. Ran go mod vendor
5. Ran make test - all tests pass ✅

Note: The workflow files (.github/workflows/release.yml and .github/workflows/test.yml) still need to be updated with the Go version change, but could not be pushed due to GitHub App permission restrictions. These should be updated manually or in a follow-up commit.

Test Plan

• make test passes successfully
• All test packages complete without errors
• Code builds successfully

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