chore: update base image for Pi 4 devices running 64-bit OS

[nicomiguelino]

Description

• Updates base image of Raspberry Pi 4 devices running 64-bit Raspberry Pi OS to balenalib/raspberrypi4-64-debian.

Checklist (General)

• I have performed a self-review of my own code.
• New and existing unit tests pass locally and on CI with my changes.
• I have done an end-to-end test for Raspberry Pi devices.
• I have tested my changes for x86 devices.
• I added a documentation for the changes I have made (when necessary).

Checklist (Detailed)

• Build a a WebView binary in an environment where base image is balenalib/raspberrypi4-64-debian.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud