bump grafana-agent container image to 0.40.4-22.04_stable #496

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 / Inclusive naming / check	10s
PR / Quality Checks / Inclusive naming / check	10s
PR / Quality Checks / Linting / Lint	13s
PR / Quality Checks / Linting / Lint	9s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	12s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	12s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	37s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	20s
PR / Quality Checks / Scenario Tests / Scenario tests	29s
PR / Quality Checks / Scenario Tests / Scenario tests	26s
PR / Quality Checks / Unit Tests / Unit tests	25s
PR / Quality Checks / Unit Tests / Unit tests	34s
PR / Quality Checks / Check libraries	30s
PR / Quality Checks / Check libraries	34s
PR / Quality Checks / Integration Tests / Integration Tests	39m 25s
PR / Quality Checks / Integration Tests / Integration Tests	37m 49s
PR / Quality Checks / CodeQL analysis / Analyze (python)	1m 47s
PR / Quality Checks / CodeQL analysis / Analyze (python)	1m 43s
	1h 25m 53s

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