chore(deps): update dependency boto3 to v1.43.39 #4828

Job	Run time
integration-tests / Plan	12s
integration-tests / Build rock (synapse)	48s
integration-tests / Build charm (synapse)	11m 5s
integration-tests / Integration tests / Integration tests (test_scaling)	22m 45s
integration-tests / Integration tests / Integration tests (test_charm)	32m 21s
integration-tests / Integration tests / Integration tests (test_s3)	28m 37s
integration-tests / Integration tests / Integration tests (test_matrix_auth)	17m 14s
integration-tests / Integration tests / Integration tests (test_nginx)	20m 7s
integration-tests / Plan Image Scanning	6s
integration-tests / Scan Image (ghcr.io-canonical-synapse-dbc4131412718464902fffd70259f4954f296293-_4.0_amd64.tar)	1m 32s
integration-tests / Required Integration Test Status Checks	2s
	2h 14m 49s

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