Prepare for release 3.0.3

[bessman]

Summary by Sourcery

Prepare for release 3.0.3 by updating the firmware version and fixing UART2 pin mappings.

Bug Fixes:

• Fix UART2 pin mappings not matching labels.

Documentation:

• Update CHANGELOG.md to include details for release 3.0.3.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request prepares the project for release 3.0.3. The changes include updating the CHANGELOG.md file with information about the new release and incrementing the patch version number in the firmware code.

File-Level Changes

Files	Changes
CHANGELOG.md	Update CHANGELOG.md with details for release 3.0.3
src/helpers/device.c	Increment patch version number from 2 to 3 in firmware code

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[sourcery-ai]

Hey @bessman - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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