update gitignore for misleading outputs #281

Job	Run time
build (cpp, ubuntu-latest)	1m 5s
build (python, ubuntu-latest)	16s
build (js, macos-latest)	1m 0s
build (cppjswasm, ubuntu-latest)	2m 2s
build (rustjswasm, ubuntu-latest)	7m 50s
build (js, ubuntu-latest)	56s
build (cppjswasm, macos-latest)	2m 6s
build (rust, ubuntu-latest)	5m 35s
build (python, macos-latest)	29s
build (jupyter, macos-latest)	2m 20s
build (rustjswasm, macos-latest)	9m 11s
build (cpp, macos-latest)	51s
build (rust, macos-latest)	6m 28s
build (jupyter, ubuntu-latest)	1m 40s
	41m 49s

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