chore(deps): update gentoo/stage3:latest docker digest to 30976d7 #5985

Job	Run time
Check depencencies	47s
Check for file changes	5s
Check pull request title	0s
Check hyperlinks	44s
Lint the Dockerfile code	33s
Check the documentation	0s
Lint the shell code	14s
Lint the yaml code	5s
Test source on NetBSD	0s
Test source on OpenBSD	0s
Test source on FreeBSD	0s
Test ${{ matrix.job-purpose }} on ${{ matrix.os-friendly-name }}	0s
Docker image for Gentoo	2h 0m 40s
Docker image for Alpine	3s
Docker image for Amazon Linux	5s
Docker image for Arch	2s
Docker image for Clear Linux	3s
Docker image for Debian	5s
Docker image for Fedora	3s
Docker image for Kali	4s
Docker image for Manjaro	5s
Docker image for Oracle Linux	5s
Docker image for Red Hat Enterprise	6s
Docker image for Rocky Linux	6s
Docker image for SUSE Enterprise	4s
Docker image for Ubuntu	3m 38s
Docker image for openSUSE Leap	8s
Docker image for openSUSE Tumbleweed	4s
	2h 7m 49s

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