chore(deps): update gentoo/stage3:latest docker digest to fcdf663 #5838

Job	Run time
Check pull request title	0s
Check for file changes	2s
Check depencencies	43s
Check hyperlinks	46s
Lint the Dockerfile code	30s
Lint the shell code	10s
Check the documentation	0s
Lint the yaml code	3s
Test source on OpenBSD	0s
Test source on FreeBSD	0s
Test source on NetBSD	0s
Test ${{ matrix.job-purpose }} on ${{ matrix.os-friendly-name }}	0s
Docker image for Gentoo	1h 43m 22s
Docker image for Alpine	4s
Docker image for Amazon Linux	3s
Docker image for Arch	3s
Docker image for Clear Linux	4s
Docker image for Debian	5s
Docker image for Fedora	2s
Docker image for Kali	4s
Docker image for Manjaro	3s
Docker image for Oracle Linux	6s
Docker image for Red Hat Enterprise	2s
Docker image for Rocky Linux	3s
Docker image for SUSE Enterprise	4s
Docker image for Ubuntu	17m 41s
Docker image for openSUSE Leap	3s
Docker image for openSUSE Tumbleweed	3s
	2h 4m 6s

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