Fix CI workflow Go version to match go.mod requirement

[Copilot]

The CI workflow was failing because of a Go version mismatch. The go.mod file specifies Go 1.25.1 as the required version, but the CI workflow was using go-version: ["stable"], which defaults to Go 1.25.0.

This mismatch was causing the 'test' job to fail during the build and test phases, as Go 1.25.0 doesn't satisfy the minimum version requirement specified in go.mod.

Changes made:

• Updated .github/workflows/ci.yml to explicitly use Go version 1.25.1 instead of "stable"
• This ensures the CI environment matches the exact Go version required by the project

Impact:

• Resolves CI test failures caused by the Go version mismatch
• Ensures consistent Go version usage across development and CI environments
• Maintains compatibility with the project's minimum Go version requirement

The fix is minimal and surgical - only changing the Go version specification in the CI matrix to match the go.mod requirement.

This pull request was created as a result of the following prompt from Copilot chat.

The 'test' job in the CI workflow is failing because the Go version required by the go.mod file is 1.25.1, but the job is running with Go 1.25.0.

To fix this, please update the .github/workflows/ci.yml file to use Go version 1.25.1.

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