Require PHP 8 and bump dependencies

[fdalcin]

This PR updates this repo to require PHP 8.0 and adds PHP 8.1 to the experimental test matrix. It also updates some dependencies. Partial fix for https://github.com/pressbooks/private/issues/1024.

[private-packagist]

composer.lock

Package changes

Package	Operation	From	To	Changes
squizlabs/php_codesniffer	upgrade	3.5.8	3.7.1	diff

Dev Package changes

Package	Operation	From	To	Changes
humanmade/coding-standards	upgrade	v1.1.3	v1.2.1	diff
nikic/php-parser	upgrade	v4.14.0	v4.15.2	diff
phpcompatibility/phpcompatibility-paragonie	upgrade	1.3.1	1.3.2	diff
phpcompatibility/phpcompatibility-wp	upgrade	2.1.3	2.1.4	diff
phpunit/php-code-coverage	upgrade	9.2.15	9.2.18	diff
phpunit/phpunit	upgrade	9.5.21	9.5.26	diff
sebastian/comparator	upgrade	4.0.6	4.0.8	diff
sebastian/exporter	upgrade	4.0.4	4.0.5	diff
sebastian/type	upgrade	3.0.0	3.2.0	diff
wp-coding-standards/wpcs	upgrade	2.2.1	2.3.0	diff
yoast/phpunit-polyfills	upgrade	1.0.3	1.0.4	diff
phpdocumentor/reflection-common	remove	2.2.0	-	-
phpdocumentor/reflection-docblock	remove	5.3.0	-	-
phpdocumentor/type-resolver	remove	1.6.1	-	-
phpspec/prophecy	remove	v1.15.0	-	-
webmozart/assert	remove	1.11.0	-	-

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