refactor: migrate to LineSearch.jl #71

Job	Run time
test (Core, min, ubuntu-latest)	25s
test (Core, min, macos-latest)	17s
test (Core, min, windows-latest)	1m 3s
test (Core, 1, ubuntu-latest)	19s
test (Core, 1, macos-latest)	18s
test (Core, 1, windows-latest)	1m 0s
test (Downstream, min, ubuntu-latest)	19s
test (Downstream, min, macos-latest)	18s
test (Downstream, min, windows-latest)	1m 53s
test (Downstream, 1, ubuntu-latest)	25s
test (Downstream, 1, macos-latest)	17s
test (Downstream, 1, windows-latest)	54s
test (Misc, min, ubuntu-latest)	18s
test (Misc, min, macos-latest)	19s
test (Misc, min, windows-latest)	56s
test (Misc, 1, ubuntu-latest)	19s
test (Misc, 1, macos-latest)	21s
test (Misc, 1, windows-latest)	1m 10s
test (Wrappers, min, ubuntu-latest)	20s
test (Wrappers, min, macos-latest)	19s
test (Wrappers, min, windows-latest)	55s
test (Wrappers, 1, ubuntu-latest)	21s
test (Wrappers, 1, macos-latest)	17s
test (Wrappers, 1, windows-latest)	1m 12s
	14m 15s

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