chore(deps): update dependency arduino/arduinocore-avr to v1.8.8

[renovate]

This PR contains the following updates:

Package	Update	Change
arduino/ArduinoCore-avr	patch	1.8.6 → 1.8.8

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Release Notes

arduino/ArduinoCore-avr (arduino/ArduinoCore-avr)

v1.8.8

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What's Changed

• String::concat increase buffer size to fit float/double value by @​pennam in #​622

Full Changelog: arduino/ArduinoCore-avr@1.8.7...1.8.8

v1.8.7

Compare Source

What's Changed

• Updated board names by @​jhansson-ard in #​523
• Check boundaries converting float/double to String. Fixes CVE-2025-69209 by @​pennam in #​613

New Contributors

• @​jhansson-ard made their first contribution in #​523
• @​pennam made their first contribution in #​613

Full Changelog: arduino/ArduinoCore-avr@1.8.6...1.8.7

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