Drop compatibility with PHP 7.2 and 7.3

[pls78]

Summary

This PR can be summarized in the following changelog entry:

• Drops compatibility with PHP 7.2 and 7.3.

Relevant technical choices:

• N/A

Test instructions

This PR can be tested by following these steps:

• Follow the same test instructions in this PR.

Fixes #397

[private-packagist]

composer.lock

Dev Package changes

Package	Operation	From	To	About
nikic/php-parser	add	-	v5.4.0	view code - License: BSD 3-Clause "New" or "Revised" License
phpunit/php-invoker	add	-	3.1.1	view code - License: BSD 3-Clause "New" or "Revised" License
sebastian/cli-parser	add	-	1.0.2	view code - License: BSD 3-Clause "New" or "Revised" License
sebastian/code-unit	add	-	1.0.8	view code - License: BSD 3-Clause "New" or "Revised" License
sebastian/complexity	add	-	2.0.3	view code - License: BSD 3-Clause "New" or "Revised" License
sebastian/lines-of-code	add	-	1.0.4	view code - License: BSD 3-Clause "New" or "Revised" License
mockery/mockery	upgrade	1.3.6	1.6.12	diff
myclabs/deep-copy	upgrade	1.12.1	1.13.0	diff
phpcsstandards/phpcsextra	upgrade	1.2.1	1.3.0	diff
phpstan/phpdoc-parser	upgrade	1.33.0	2.1.0	diff
phpunit/php-code-coverage	upgrade	7.0.17	9.2.32	diff
phpunit/php-file-iterator	upgrade	2.0.6	3.0.6	diff
phpunit/php-text-template	upgrade	1.2.1	2.0.4	diff
phpunit/php-timer	upgrade	2.1.4	5.0.3	diff
phpunit/phpunit	upgrade	8.5.41	9.6.22	diff
sebastian/code-unit-reverse-lookup	upgrade	1.0.3	2.0.3	diff
sebastian/comparator	upgrade	3.0.5	4.0.8	diff
sebastian/diff	upgrade	3.0.6	4.0.6	diff
sebastian/environment	upgrade	4.2.5	5.1.5	diff
sebastian/exporter	upgrade	3.1.6	4.0.6	diff
sebastian/global-state	upgrade	3.0.5	5.0.7	diff
sebastian/object-enumerator	upgrade	3.0.5	4.0.4	diff
sebastian/object-reflector	upgrade	1.1.3	2.0.4	diff
sebastian/recursion-context	upgrade	3.0.2	4.0.5	diff
sebastian/resource-operations	upgrade	2.0.3	3.0.4	diff
sebastian/type	upgrade	1.1.5	3.2.1	diff
sebastian/version	upgrade	2.0.1	3.0.2	diff
slevomat/coding-standard	upgrade	8.15.0	8.17.0	diff
squizlabs/php_codesniffer	upgrade	3.12.0	3.12.2	diff
yoast/phpunit-polyfills	upgrade	1.1.2	1.1.4	diff
phpunit/php-token-stream	remove	3.1.3	-	-

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