GHA: Avoid the broken diffutils 3.11 release #4095

Job	Run time
Analyse	45s
Cygwin	2m 2s
Build-macOS (4.14.2)	5m 20s
Build-Linux (4.08.1)	5m 7s
Build-macOS (5.3.0)	6m 54s
Build-Linux (4.09.1)	5m 21s
Hygiene	25s
Build-Linux (4.10.2)	5m 3s
Test-macOS (4.14.2)	32m 13s
Test-macOS (5.3.0)	37m 44s
Build-Linux (4.11.2)	5m 15s
Build-Linux (4.12.1)	5m 36s
Build-Linux (4.13.1)	5m 27s
Build-Linux (5.0.0)	6m 19s
Build-Linux (5.1.1)	5m 25s
Build-Linux (5.2.1)	5m 55s
Build-Linux (4.14.2)	5m 14s
Build-Linux (5.3.0)	6m 6s
Build-Windows (x86_64-pc-cygwin, x86_64-pc-cygwin, 4.14.2)	35m 20s
Build-Windows (i686-w64-mingw32, x86_64-pc-cygwin, 4.14.2)	41m 34s
Build-Windows (x86_64-w64-mingw32, x86_64-pc-cygwin, 4.14.2)	40m 21s
Build-Windows (i686-pc-windows, x86_64-pc-cygwin, 4.14.2)	44m 47s
Build-Windows (x86_64-pc-windows, x86_64-pc-cygwin, 4.14.2)	47m 12s
Build-Windows (x86_64-w64-mingw32, x86_64-pc-cygwin, 5.3.0)	42m 58s
Build-Windows (x86_64-pc-windows, x86_64-pc-cygwin, 5.3.0)	42m 25s
Cold-Linux	6m 16s
Doc-Linux (4.14.2)	4m 31s
Test-Linux (4.14.2)	14m 42s
Solvers-Linux (z3, 4.14.2)	18m 58s
Doc-Linux (5.3.0)	4m 28s
Test-Linux (5.3.0)	14m 19s
Solvers-Linux (z3, 5.3.0)	16m 30s
Upgrade-Linux (4.14.2)	1m 47s
Solvers-Linux (0install, 4.14.2)	5m 36s
Upgrade-Linux (5.3.0)	1m 45s
Solvers-Linux (0install, 5.3.0)	5m 44s
Upgrade-macOS (4.14.2)	2m 47s
Solvers-macOS (z3, 4.14.2)	12m 29s
Upgrade-macOS (5.3.0)	2m 33s
Solvers-macOS (z3, 5.3.0)	15m 48s
Solvers-macOS (0install, 4.14.2)	7m 11s
Solvers-macOS (0install, 5.3.0)	6m 13s
	9h 42m 25s

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