fix: resolve YAML syntax error in merge-bot workflow

[vilsonrodrigues]

Summary

This PR fixes a critical YAML syntax error in the merge-bot workflow that is preventing the workflow from running correctly.

Problem

The workflow file has an error on line 420 that causes GitHub Actions to fail parsing the file:

Error: You have an error in your yaml syntax on line 420

Root cause: The JavaScript template literal contains ${pr.base.ref} which GitHub Actions' YAML parser is interpreting as an attempt at variable interpolation, causing a syntax error.

body: `...
\`\`\`bash
git fetch upstream ${pr.base.ref}   // ❌ Causes YAML parsing error
git merge upstream/${pr.base.ref}
git push
\`\`\`
...`

Solution

Extract pr.base.ref to a local variable before using it in the template literal:

const baseBranch = pr.base.ref;      // ✅ Extract to variable
await github.rest.issues.createComment({
  ...
  body: `...
\`\`\`bash
git fetch upstream ${baseBranch}    // ✅ Use local variable
git merge upstream/${baseBranch}
git push
\`\`\`
...`
});

Changes

• Add const baseBranch = pr.base.ref; before the comment creation
• Replace ${pr.base.ref} with ${baseBranch} in the template string

Impact

✅ Fixes workflow validation: GitHub Actions will accept the workflow file
✅ No functional changes: The behavior remains exactly the same
✅ Enables /update command: The update command can now work properly

Testing

After merge:

• ✅ Workflow file validation should pass in GitHub Actions
• ✅ The /update command can be tested on PR docs: enhance module docstring (TEST PR for /update command) #20

Related

• Follow-up to PR fix: improve mergebot /update command with better fork handling and checkout #19 which introduced the /update command
• Discovered when CI failed after PR fix: improve mergebot /update command with better fork handling and checkout #19 was merged

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