bootstrap-haskell.ps1: don't exit if tmp file removal fails #1070

Job	Run time
Build ARM binary (self-hosted, Linux, ARM64, armv7-linux-ghcup, 9.2.2, ARM)	38m 37s
Build ARM binary (self-hosted, Linux, ARM64, aarch64-linux-ghcup, 9.2.6, ARM64)	16m 8s
Build linux binary (ubuntu-latest, i386-linux-ghcup, 8.10.7, 32)	18m 6s
Build binary (Mac/Win) (self-hosted, macOS, ARM64, aarch64-apple-darwin-ghcup, 9.2.6, ARM64)	52s
Build linux binary (ubuntu-latest, x86_64-linux-ghcup, 8.10.7, 64)	17m 56s
Build binary (Mac/Win) (macOS-11, x86_64-apple-darwin-ghcup, 9.2.6, 64)	36m 21s
Build binary (Mac/Win) (windows-latest, x86_64-mingw64-ghcup, 8.10.7, 64)	2m 58s
hls	27m 59s
Test linux (ubuntu-latest, i386-linux-ghcup, 8.10.7, 32, Alpine)	2m 23s
Test linux (ubuntu-latest, x86_64-linux-ghcup, 8.10.7, 64, Alpine)	2m 1s
Test linux (ubuntu-latest, x86_64-linux-ghcup, 8.10.7, 64, Ubuntu)	4m 39s
Test Mac/Win	0s
Test ARM (self-hosted, Linux, ARM64, armv7-linux-ghcup, 9.2.2, ARM, Ubuntu)	7m 10s
Test ARM (self-hosted, Linux, ARM64, aarch64-linux-ghcup, 9.2.6, ARM64, Ubuntu)	7m 15s
release	0s
	3h 2m 25s

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