chore(deps): update gentoo/stage3:latest docker digest to 709fb5c (#1… #6410

Job	Run time
Check pull request title	0s
Check for file changes	5s
Check depencencies	58s
Check hyperlinks	46s
Lint the shell code	10s
Lint the yaml code	3s
Lint the Dockerfile code	29s
Check the documentation	0s
Test source on OpenBSD	0s
Test source on NetBSD	0s
Test ${{ matrix.job-purpose }} on ${{ matrix.os-friendly-name }}	0s
Test source on FreeBSD	0s
Docker image for Gentoo	1h 51m 48s
Docker image for Alpine	5s
Docker image for Amazon Linux	6s
Docker image for Arch	5s
Docker image for Clear Linux	5s
Docker image for Debian	3s
Docker image for Fedora	3s
Docker image for Kali	3s
Docker image for Manjaro	5s
Docker image for Oracle Linux	3s
Docker image for Red Hat Enterprise	3s
Docker image for Rocky Linux	3s
Docker image for SUSE Enterprise	5s
Docker image for Ubuntu	5m 57s
Docker image for openSUSE Leap	3s
Docker image for openSUSE Tumbleweed	5s
	2h 1m 13s

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