Downgrade to php 7.3 #78

Job	Run time
Lint root / Lint yaml & Composer (8.0)	12s
Code Coverage / Code Coverage	12s
Dependency analysis / Dependency Analysis (8.0)	22s
Coding Standards / Coding Standards (8.0)	31s
Static analysis / Static Code Analysis (8.0)	17s
Unit test / Supported Versions Matrix	6s
Unit test / Tests (7.3, lowest)	21s
Unit test / Tests (7.3, locked)	20s
Unit test / Tests (7.3, highest)	46s
Unit test / Tests (7.4, lowest)	24s
Unit test / Tests (7.4, locked)	17s
Unit test / Tests (7.4, highest)	23s
Unit test / Tests (8.0, lowest)	21s
Unit test / Tests (8.0, locked)	18s
Unit test / Tests (8.0, highest)	40s
Unit test / Tests (8.1, lowest)	20s
Unit test / Tests (8.1, locked)	11s
Unit test / Tests (8.1, highest)	19s
Unit test / Tests (8.2, lowest)	19s
Unit test / Tests (8.2, locked)	12s
Unit test / Tests (8.2, highest)	21s
Unit test / Tests (8.3, lowest)	38s
Unit test / Tests (8.3, locked)	39s
Unit test / Tests (8.3, highest)	40s
	9m 9s

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