Bump mikey179/vfsstream from 1.6.11 to 1.6.12 #450

Job	Run time
Coding Standards	19s
Static analysis / Static Code Analysis (8.2)	42s
Lint root / Lint yaml & Composer (8.2)	10s
Dependency analysis / Dependency Analysis (8.2)	17s
Code Coverage / Code Coverage	53s
Unit test / Supported Versions Matrix	3s
Unit test / Tests (8.1, lowest)	57s
Unit test / Tests (8.1, locked)	49s
Unit test / Tests (8.1, highest)	34s
Unit test / Tests (8.2, lowest)	51s
Unit test / Tests (8.2, locked)	14s
Unit test / Tests (8.2, highest)	26s
Unit test / Tests (8.3, lowest)	25s
Unit test / Tests (8.3, locked)	20s
Unit test / Tests (8.3, highest)	26s
Integration test / Supported Versions Matrix	3s
Integration test / Tests (8.1, lowest)	36s
Integration test / Tests (8.1, locked)	17s
Integration test / Tests (8.1, highest)	30s
Integration test / Tests (8.2, lowest)	17s
Integration test / Tests (8.2, locked)	18s
Integration test / Tests (8.2, highest)	25s
Integration test / Tests (8.3, lowest)	18s
Integration test / Tests (8.3, locked)	12s
Integration test / Tests (8.3, highest)	26s
	10m 48s

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