chore(deps): update gentoo/stage3:latest docker digest to fcdf663 #5836

Job	Run time
Check for file changes	5s
Check pull request title	5s
Check depencencies	51s
Check hyperlinks	43s
Lint the yaml code	3s
Lint the Dockerfile code	35s
Lint the shell code	11s
Check the documentation	0s
Test ${{ matrix.job-purpose }} on ${{ matrix.os-friendly-name }}	0s
Test source on OpenBSD	0s
Test source on FreeBSD	0s
Test source on NetBSD	0s
Docker image for Gentoo	1h 57m 36s
Docker image for Alpine	2s
Docker image for Amazon Linux	2s
Docker image for Arch	7s
Docker image for Clear Linux	3s
Docker image for Debian	3s
Docker image for Fedora	3s
Docker image for Kali	4s
Docker image for Manjaro	6s
Docker image for Oracle Linux	3s
Docker image for Red Hat Enterprise	5s
Docker image for Rocky Linux	2s
Docker image for SUSE Enterprise	3s
Docker image for Ubuntu	5m 27s
Docker image for openSUSE Leap	3s
Docker image for openSUSE Tumbleweed	3s
	2h 6m 25s

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