chore: Update to Go 1.25.7 and Go linter 2.8.0

[lantoli]

Proposed changes

chore: Update to Go 1.25.7 and Go linter 2.8.0

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

Updates the project’s Go toolchain and static analysis tooling versions to newer releases.

Changes:

• Bumped go.mod Go version from 1.25.5 to 1.25.7
• Updated golangci-lint version to v2.8.0 in both the 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 the Go version used for module/tooling semantics
Makefile	Bumps the configured golangci-lint version used by local tooling
.github/workflows/code-health.yaml	Bumps the golangci-lint version used in CI linting job

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