Bump singer-sdk to 0.39.0 #701

Job	Run time
linting (3.12, private, REST, API Key)	52s
linting (3.12, private, REST, Bearer Token)	1m 14s
linting (3.12, private, REST, Basic Auth)	54s
linting (3.12, private, REST, OAuth2)	55s
linting (3.12, private, REST, JWT)	1m 1s
linting (3.12, private, REST, Custom or N/A)	54s
linting (3.12, private, GraphQL, API Key)	51s
linting (3.12, private, GraphQL, Bearer Token)	56s
linting (3.12, private, GraphQL, Basic Auth)	1m 1s
linting (3.12, private, GraphQL, OAuth2)	52s
linting (3.12, private, GraphQL, JWT)	52s
linting (3.12, private, GraphQL, Custom or N/A)	1m 1s
linting (3.12, public, REST, API Key)	1m 2s
linting (3.12, public, REST, Bearer Token)	57s
linting (3.12, public, REST, Basic Auth)	51s
linting (3.12, public, REST, OAuth2)	55s
linting (3.12, public, REST, JWT)	58s
linting (3.12, public, REST, Custom or N/A)	1m 1s
linting (3.12, public, GraphQL, API Key)	54s
linting (3.12, public, GraphQL, Bearer Token)	51s
linting (3.12, public, GraphQL, Basic Auth)	52s
linting (3.12, public, GraphQL, OAuth2)	53s
linting (3.12, public, GraphQL, JWT)	54s
linting (3.12, public, GraphQL, Custom or N/A)	58s
	22m 29s

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