chore: Update to Go 1.25.5 and Go linter 2.7.2

[lantoli]

Proposed changes

Update to Go 1.25.5 and Go linter 2.7.2

Please include a summary of the fix/feature/change, including any relevant motivation and context.

Link to any related issue(s):

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update
• If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Manual QA performed:

• cfn invoke for each of CRUDL/cfn test
• Updated resource in example
• Published to AWS private registry
• Used the template in example to create and update a stack in AWS
• Deleted stack to ensure resources are deleted
• Created multiple resources in same stack
• Validated in Atlas UI
• Included screenshots

Required Checklist:

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have checked that this change does not generate any credentials and that they are NOT accidentally logged anywhere.
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• For CFN Resources: I have released by changes in the private registry and proved by change
  works in Atlas

Further comments

[Copilot]

Pull request overview

This PR updates the Go toolchain from version 1.25.0 to 1.25.5 and upgrades golangci-lint from v2.4.0 to v2.7.2 across the repository's configuration files.

Key Changes:

• Go version updated to 1.25.5 in go.mod
• golangci-lint version updated to v2.7.2 in both Makefile and GitHub Actions workflow

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
cfn-resources/go.mod	Updates Go version directive to 1.25.5
Makefile	Updates GOLANGCI_VERSION variable to v2.7.2
.github/workflows/code-health.yaml	Updates golangci-lint action version to v2.7.2

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