refactor: migrate to LineSearch.jl #41

Job	Run time
test (Core, min, ubuntu-latest)	16s
test (Core, min, macos-latest)	16s
test (Core, min, windows-latest)	58s
test (Core, 1, ubuntu-latest)	26s
test (Core, 1, macos-latest)	22s
test (Core, 1, windows-latest)	1m 10s
test (Downstream, min, ubuntu-latest)	15s
test (Downstream, min, macos-latest)	23s
test (Downstream, min, windows-latest)	52s
test (Downstream, 1, ubuntu-latest)	23s
test (Downstream, 1, macos-latest)	16s
test (Downstream, 1, windows-latest)	58s
test (Misc, min, ubuntu-latest)	21s
test (Misc, min, macos-latest)	15s
test (Misc, min, windows-latest)	1m 14s
test (Misc, 1, ubuntu-latest)	15s
test (Misc, 1, macos-latest)	18s
test (Misc, 1, windows-latest)	1m 9s
test (Wrappers, min, ubuntu-latest)	16s
test (Wrappers, min, macos-latest)	17s
test (Wrappers, min, windows-latest)	1m 8s
test (Wrappers, 1, ubuntu-latest)	23s
test (Wrappers, 1, macos-latest)	21s
test (Wrappers, 1, windows-latest)	1m 7s
	13m 39s

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