Bump JamesIves/github-pages-deploy-action from 4.6.8 to 4.6.9 #757

Job	Run time
docker-master	1h 30m 35s
publish-standalone-dry-run	19s
test-standalone (master, dev, default)	1m 31s
build-js-of-ocaml (master, 4.11.1)	18m 18s
generated-files (master)	39m 9s
build-wasm-of-ocaml (master, 4.14.1)	17m 3s
standalone-haskell (master)	46m 10s
test-amd64	2h 30m 39s
validate-docker-master	8m 15s
deploy-js-wasm-of-ocaml	5m 45s
docker-check-all	7s
	6h 17m 51s

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