feat: Update Go version support to 1.25.x and 1.24.x

[Copilot]

The repository was testing against Go 1.22.x and 1.21.x, but Go's release policy requires supporting the current and previous major releases. Go 1.25 and 1.24 are now the supported versions.

Changes

• go.mod: Updated minimum version from 1.22 to 1.25
• CI workflow: Updated test matrix from [1.22.x, 1.21.x] to [1.25.x, 1.24.x]
• CI workflow: Updated lint job to use Go 1.25.x
• .gitignore: Added coverage.out to exclude test artifacts

Original prompt

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This section details on the original issue you should resolve

<issue_title>Untested on recent version of Go</issue_title>
<issue_description>In the README.md file it states:

Our support of Go versions is aligned with Go's version release policy. So we will support a major version of Go until there are two newer major releases. We no longer support building this package with unsupported Go versions, as these contain security vulnerabilities which will not be fixed.

The go version hasn't been updated for quite a while. We need to ensure this package still works with the latest version of Go.</issue_description>

<agent_instructions>- update the application to the latest version of Go

• ensure workflow tests are also updated to reflect the version policy stated in the readme</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Untested on recent version of Go #247

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[coveralls]

Pull Request Test Coverage Report for Build 19190848360

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.738%

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Totals
Change from base Build 14026929583:	0.0%
Covered Lines:	1724
Relevant Lines:	1859

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💛 - Coveralls