bump peaceiris/actions-gh-pages #259

Job	Run time
build (jupyter, ubuntu-latest)	1m 47s
build (cpp, ubuntu-latest)	1m 18s
build (python, ubuntu-latest)	17s
build (js, ubuntu-latest)	1m 9s
build (rust, ubuntu-latest)	5m 47s
build (cppjswasm, macos-latest)	2m 38s
build (python, macos-latest)	29s
build (rustjswasm, macos-latest)	8m 5s
build (rustjswasm, ubuntu-latest)	8m 38s
build (js, macos-latest)	1m 10s
build (cpp, macos-latest)	1m 29s
build (jupyter, macos-latest)	1m 46s
build (cppjswasm, ubuntu-latest)	2m 9s
build (rust, macos-latest)	5m 58s
	42m 40s

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