Use try-with-resources to close TracingDataSource

[coveralls]

Pull Request Test Coverage Report for Build 279

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.3%) to 47.963%

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Totals
Change from base Build 278:	0.3%
Covered Lines:	471
Relevant Lines:	982

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💛 - Coveralls