Bump version to 26.9.21.1

[bharvey88]

Version: 26.9.21.1

What does this implement/fix?

• Bumps the version to 26.9.21.1 for the hotfix release to main. No other changes.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

_{🤖 Generated with Claude Code}

Summary by CodeRabbit

• Chores
  • Updated the ESPHome configuration version from 26.9.18.1 to 26.9.21.1.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 375b4c17-0e16-4300-b3a6-c21c95041b0c

📥 Commits

Reviewing files that changed from the base of the PR and between 299c475 and 361cee2.

📒 Files selected for processing (1)

• Integrations/ESPHome/Core.yaml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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Walkthrough

The ESPHome core configuration updates its version substitution from 26.9.18.1 to 26.9.21.1.

Changes

ESPHome core configuration

Layer / File(s)	Summary
Update version substitution Integrations/ESPHome/Core.yaml	The version substitution changes from 26.9.18.1 to 26.9.21.1.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Suggested reviewers: bunton33

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the version update from 26.9.18.1 to 26.9.21.1.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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_{A rabbit checks the version line
The numbers hop in neat design
Core.yaml wears a newer tune
Its update lands beneath the moon
One small change, precise and bright}

_{Comment @coderabbitai help to get the list of available commands.}