chore(deps): update dependency opencensus to v0.7.13

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
opencensus	==0.7.12 -> ==0.7.13

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Release Notes

census-instrumentation/opencensus-python

v0.7.13

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opencensus-ext-azure 1.0.8

• Fix logger.exception with no exception info throwing error (#​1006)
• Add enable_local_storage to turn on/off local storage + retry + flushing logic (#​1006)

opencensus-ext-django 0.7.5

• Add exception tracing to django middleware (#​885)

opencensus-ext-flask 0.7.5

• Restrict flask version 1.1.3 as it throws an exception on Python v2.7 - pallets/flask#​4050 (#​1032)

opencensus-ext-requests 0.7.5

• Fix duplicate spans being emitted from requests (#​1014)

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