Resolve vulnerability warnings by bumping Go to 1.24.12 (#934)

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The following PR fixes the failing validation checks on our CI. 

## Motivation and Context
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## How Has This Been Tested?
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## Breaking Changes
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## Types of changes
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- [ ] 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 change)
- [ ] Documentation update

## Checklist
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- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

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Signed-off-by: Radoslav Dimitrov <radoslav@stacklok.com>

go.mod

@@ -1,6 +1,6 @@
 module github.com/modelcontextprotocol/registry
 
-go 1.24.11
+go 1.24.12
 
 require (
 	cloud.google.com/go/kms v1.25.0