chore(deps): update elasticsearch docker tag to v7.17.21 - autoclosed #5186

Job	Run time
Lint Dockerfile	9s
Build	4m 19s
Lint (frontend)	33s
Test (frontend)	48s
Lint (alert-cli)	38s
Test (alert-cli)	44s
Lint (ingester)	38s
Test (ingester)	48s
Lint (export-elasticsearch)	37s
Test (export-elasticsearch)	50s
Lint (@socialgouv/cdtn-elasticsearch)	34s
Test (@socialgouv/cdtn-elasticsearch)	36s
Test (@shared/utils)	45s
	11m 59s

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