Add User-Agent for fetch and download to fix api calls #92

Job	Run time
build-web	6m 18s
build-cli	3m 49s
build-docker-aarch64 (Dockerfile, slim)	20m 45s
build-docker-amd64 (Dockerfile, slim)	9m 51s
test (ubuntu-latest)	5m 41s
test (macos-latest)	9m 48s
test (windows-latest)	22m 18s
build-desktop (ubuntu-latest)	19m 38s
build-desktop (macos-latest)	28m 20s
build-desktop (windows-latest)	36m 28s
docker-build-merge (Dockerfile, slim)	43s
	2h 43m 39s

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