Ensure the right versions of packages are used when simulating pinning #4119

Job	Run time
Analyse	4s
Test-macOS (4.14.2)	18m 47s
Build-Linux (4.08.1)	2m 24s
Test-macOS (5.3.0)	18m 20s
Cygwin	6s
Build-Linux (4.09.1)	2m 25s
Build-macOS (4.14.2)	4m 7s
Build-Linux (4.10.2)	2m 26s
Hygiene	25s
Build-Linux (4.11.2)	2m 21s
Build-macOS (5.3.0)	3m 57s
Build-Linux (4.12.1)	2m 34s
Build-Linux (4.13.1)	2m 29s
Build-Linux (5.0.0)	2m 41s
Build-Linux (5.1.1)	2m 18s
Build-Linux (5.2.1)	2m 27s
Build-Linux (4.14.2)	2m 17s
Build-Linux (5.3.0)	2m 29s
Build-Windows (x86_64-pc-cygwin, x86_64-pc-cygwin, 4.14.2)	35m 59s
Build-Windows (i686-w64-mingw32, x86_64-pc-cygwin, 4.14.2)	38m 35s
Build-Windows (x86_64-w64-mingw32, x86_64-pc-cygwin, 4.14.2)	42m 30s
Build-Windows (i686-pc-windows, x86_64-pc-cygwin, 4.14.2)	42m 58s
Build-Windows (x86_64-pc-windows, x86_64-pc-cygwin, 4.14.2)	43m 37s
Build-Windows (x86_64-w64-mingw32, x86_64-pc-cygwin, 5.3.0)	41m 19s
Build-Windows (x86_64-pc-windows, x86_64-pc-cygwin, 5.3.0)	42m 35s
Cold-Linux	5m 13s
Doc-Linux (4.14.2)	1m 20s
Test-Linux (4.14.2)	7m 48s
Solvers-Linux (z3, 4.14.2)	52s
Upgrade-Linux (4.14.2)	1m 38s
Doc-Linux (5.3.0)	1m 12s
Test-Linux (5.3.0)	8m 2s
Solvers-Linux (z3, 5.3.0)	54s
Upgrade-Linux (5.3.0)	1m 31s
Solvers-Linux (0install, 4.14.2)	1m 21s
Solvers-Linux (0install, 5.3.0)	1m 40s
Upgrade-macOS (4.14.2)	2m 36s
Solvers-macOS (z3, 4.14.2)	1m 25s
Upgrade-macOS (5.3.0)	1m 48s
Solvers-macOS (z3, 5.3.0)	1m 37s
Solvers-macOS (0install, 4.14.2)	1m 40s
Solvers-macOS (0install, 5.3.0)	1m 47s
	6h 42m 34s

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