Update layers/meta-balena digest to 743309f

[balena-renovate]

This PR contains the following updates:

Package	Update	Change
layers/meta-balena	digest	4c37653 -> 743309f

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This PR has been generated by Renovate Bot.

[floion]

@resin-jenkins test this please

[acostach]

@resin-jenkins retest this please

[acostach]

Hi @ajlennon , it looks like the DUT in the autokit no longer boots any flasher image. These are the UART logs during the test run:

Can't find PMIC:PCA9450
DDRINFO: start DRAM init
DDRINFO: DRAM rate 3000MTS
DDRINFO:ddrphy calibration done
DDRINFO: ddrmix config done
SEC0:  RNG instantiated
NOTICE:  BL31: v2.4(release):lf-5.10.52-2.1.0-rc2-0-gbb4957067
NOTICE:  BL31: Built : 04:45:39, Sep  8 2021