Update pihole/pihole Docker tag to v5.8.1

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This PR contains the following updates:

Package	Update	Change
pihole/pihole	minor	v5.5.1 -> v5.8.1

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Release Notes

pi-hole/docker-pi-hole

v5.8.1

Compare Source

Tagged to include Pi-hole FTL v5.8.1:

https://github.com/pi-hole/FTL/pull/1116

Retagged to include Pi-hole Web v5.5.1

https://github.com/pi-hole/AdminLTE/pull/1856

Docker Specific Changes:

• [BugFix] Ignore SKIPGRAVITYONBOOT if gravity.db does not exist #​881
• [BugFix-BugFix] Fix gravityDB check #​883
• [BugFix] Remove Unneccessary kill -9 #​888
• [BugFix] Remove no longer needed workaround for resolvconf #​882
• [BugFix] Remove obsolete debconf-apt-progress workaround #​879
• [Docs] Add documentation for WEBPASSWORD_FILE #​869
• [Docs] Fix DNS_BOGUS_PRIV description #​857
• [Docs] Small correction in the 'Quick Start' section of the README #​886
• [Docs] Update README.md to add changes in #​867 #​873
• [Docs] Use nginxproxy's DockerHub registry #​890
• [Housekeeping] Remove broken doco-example.yml symlink #​737
• [Infrasctucture] Switch multiarch/debian-debootstrap to pihole/debian-debootstrap to fix build issues #​892
• [Infrastructure] Single versions file #​861
• [Infrastructure] install.sh overhaul #​843
• [New Feature] Add CACHE_SIZE environment variable to the available options #​689
• [New Feature] Adding CORS_HOSTS to PHP environment #​867
• [New Feature] Introduced WEBTHEME environment variable to control user interface theme selection. #​856

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