Downgrade to php 7.3 #79

Job	Run time
Coding Standards / Coding Standards (8.0)	22s
Dependency analysis / Dependency Analysis (8.0)	14s
Code Coverage / Code Coverage	13s
Lint root / Lint yaml & Composer (8.0)	10s
Static analysis / Static Code Analysis (8.0)	20s
Unit test / Supported Versions Matrix	7s
Unit test / Tests (7.3, lowest)	41s
Unit test / Tests (7.3, locked)	12s
Unit test / Tests (7.3, highest)	41s
Unit test / Tests (7.4, lowest)	21s
Unit test / Tests (7.4, locked)	17s
Unit test / Tests (7.4, highest)	24s
Unit test / Tests (8.0, lowest)	49s
Unit test / Tests (8.0, locked)	16s
Unit test / Tests (8.0, highest)	22s
Unit test / Tests (8.1, lowest)	24s
Unit test / Tests (8.1, locked)	16s
Unit test / Tests (8.1, highest)	43s
Unit test / Tests (8.2, lowest)	44s
Unit test / Tests (8.2, locked)	11s
Unit test / Tests (8.2, highest)	22s
Unit test / Tests (8.3, lowest)	50s
Unit test / Tests (8.3, locked)	47s
Unit test / Tests (8.3, highest)	40s
	10m 26s

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