(chore) bump go version and deps

[ncode]

This pull request updates the project's CI workflow and dependencies to use newer versions, ensuring better compatibility, security, and support for the latest Go features. The most important changes are grouped below:

CI Workflow Updates:

• Upgraded GitHub Actions in .github/workflows/ci.yml to use newer versions: actions/checkout (v5), actions/setup-go (v6), and codecov/codecov-action (v5.5.1). Also, updated the Go version used in CI to 1.25.

Dependency Upgrades:

• Updated the go.mod file to require Go 1.25 and upgraded several key dependencies (github.com/hashicorp/consul/api, github.com/spf13/cobra, github.com/spf13/viper, github.com/stretchr/testify, etc.) to their latest versions for improved stability and feature support.
• Added and upgraded indirect dependencies in go.mod, including github.com/spf13/pflag, github.com/go-viper/mapstructure/v2, and others, to ensure compatibility with the updated direct dependencies.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.54%. Comparing base (ac6163b) to head (f17a016).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   65.54%   65.54%           
=======================================
  Files           7        7           
  Lines         415      415           
=======================================
  Hits          272      272           
  Misses        136      136           
  Partials        7        7           

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