Update dependency express-prom-bundle to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
express-prom-bundle	5.1.5 -> 6.3.6

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Release Notes

jochen-schweizer/express-prom-bundle

v6.3.6

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v6.3.5

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• readme now mentions previously hidden option httpDurationMetricName

v6.3.4

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• type definitions for urlValueParser now allow passing RegExp directly (thanks to @​thewizarodofoz)

v6.3.3

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• default metrics middleware now handles errors, see PR #​78 (thanks to @​FauxFaux)

v6.3.2

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• peer dependency prom-client set to >=12.0.0 instead of ^13.0.0 (it was a regression), thanks to @​billyjanitsch

Minor dev changes:

• travis now run tests on node 14 instead of 13
• added eslint test to travis build
• dtslint now tests only the latest TS version on travis. This was a workaround for dtslint failing on travis when referencing types for prom-client in older versions of TS

v6.3.1

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Support for breaking changes in prom-client@13 - .metrics() and .clusterMetrics() now return a Promise. See #​71

v6.3.0

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• added bypass() option, thanks to @​yacineb

v6.2.0

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• update types to correct transformLabels (#​43) - thanks to @​GabrielCastro
• metricsMiddleware declared as accessible in type definitions (#​56) - thanks to @​ankon (and @​jorge07 for pushing for it)

v6.1.0

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• added promRegistry parameter for custom registry (thanks @​aaronleesmith)
• add missing type definition for httpDurationMetricName (thanks @​anxolin)
• fixed spelling in docs (thanks @​jonaskello)
• bump several dev. tools dependencies

v6.0.0

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• prom-client updated to v12

see #​51 (thanks to @​sam-github)

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