Update singer-sdk to 0.40.0 (#277) #715

Job	Run time
linting (3.12, private, REST, API Key)	59s
linting (3.12, private, REST, Bearer Token)	1m 2s
linting (3.12, private, REST, Basic Auth)	52s
linting (3.12, private, REST, OAuth2)	58s
linting (3.12, private, REST, JWT)	59s
linting (3.12, private, REST, Custom or N/A)	57s
linting (3.12, private, GraphQL, API Key)	1m 0s
linting (3.12, private, GraphQL, Bearer Token)	58s
linting (3.12, private, GraphQL, Basic Auth)	1m 1s
linting (3.12, private, GraphQL, OAuth2)	1m 0s
linting (3.12, private, GraphQL, JWT)	56s
linting (3.12, private, GraphQL, Custom or N/A)	57s
linting (3.12, public, REST, API Key)	53s
linting (3.12, public, REST, Bearer Token)	58s
linting (3.12, public, REST, Basic Auth)	59s
linting (3.12, public, REST, OAuth2)	51s
linting (3.12, public, REST, JWT)	52s
linting (3.12, public, REST, Custom or N/A)	1m 7s
linting (3.12, public, GraphQL, API Key)	53s
linting (3.12, public, GraphQL, Bearer Token)	54s
linting (3.12, public, GraphQL, Basic Auth)	58s
linting (3.12, public, GraphQL, OAuth2)	53s
linting (3.12, public, GraphQL, JWT)	53s
linting (3.12, public, GraphQL, Custom or N/A)	55s
	22m 45s

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