bump grafana-agent container image to 0.40.4-22.04_stable #497

Job	Run time
PR / Check against ignorelist	3s
PR / Check against ignorelist	3s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	18s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	18s
PR / Quality Checks / Inclusive naming / check	10s
PR / Quality Checks / Inclusive naming / check	10s
PR / Quality Checks / Linting / Lint	17s
PR / Quality Checks / Linting / Lint	17s
PR / Quality Checks / Scenario Tests / Scenario tests	25s
PR / Quality Checks / Scenario Tests / Scenario tests	25s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	14s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	14s
PR / Quality Checks / Unit Tests / Unit tests	32s
PR / Quality Checks / Unit Tests / Unit tests	32s
PR / Quality Checks / Check libraries	20s
PR / Quality Checks / Check libraries	20s
PR / Quality Checks / Integration Tests / Integration Tests	36m 18s
PR / Quality Checks / Integration Tests / Integration Tests	38m 3s
PR / Quality Checks / CodeQL analysis / Analyze (python)	1m 42s
PR / Quality Checks / CodeQL analysis / Analyze (python)	1m 42s
	1h 22m 25s

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