build(deps): bump docker/build-push-action from 6.7.0 to 6.9.0 #19

Job	Run time
changes	3s
prechecks / style	58s
prechecks / import-check	2m 22s
prechecks / bootstrap-dev-rhel8	4m 9s
prechecks / validate	34s
prechecks / audit / package-audits (windows-latest, powershell Invoke-Expression -Command "./share/spack/qa/windows_t...	4m 58s
prechecks / audit / package-audits (ubuntu-latest, bash)	8m 6s
prechecks / audit / package-audits (macos-latest, bash)	4m 57s
all-prechecks	1s
bootstrap	0s
unit-tests	0s
coverage	0s
all	0s
	26m 8s

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