fix: pin hardware-observer to rev70 (#163) #95

Job	Run time
release / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
release / Quality Checks / Static Analysis / Static Analysis of Charm	22s
release / Quality Checks / Inclusive naming / check	10s
release / Quality Checks / Linting / Lint	11s
release / Quality Checks / Scenario Tests / Scenario tests	21s
release / Quality Checks / Static Analysis / Static Analysis of Libs	19s
release / Quality Checks / Unit Tests / Unit tests	23s
release / Quality Checks / Check libraries	32s
release / Quality Checks / Integration Tests / Integration Tests	57m 9s
release / Quality Checks / CodeQL analysis / Analyze (python)	2m 4s
release / Release any bumped charm library	26s
release / Release Charm and Libraries / Build the charms for ARM	53m 28s
release / Release Charm and Libraries / Build the charms	33m 18s
release / Release Charm and Libraries / Release to CharmHub (grafana-agent_ubuntu-20.04-amd64.charm)	36s
release / Release Charm and Libraries / Release to CharmHub (grafana-agent_ubuntu-22.04-amd64.charm)	35s
release / Release Charm and Libraries / Charm List	1s
release / Release Charm and Libraries / Release arm64 to CharmHub (grafana-agent_ubuntu-20.04-arm64.charm)	32s
release / Release Charm and Libraries / Release arm64 to CharmHub (grafana-agent_ubuntu-22.04-arm64.charm)	55s
	2h 31m 23s

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