chore(deps) Update dependency Hangfire to v1.8.7

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Hangfire (source)	1.8.6 -> 1.8.7

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Release Notes

HangfireIO/Hangfire (Hangfire)

### [`v1.8.7`](https://togithub.com/HangfireIO/Hangfire/releases/tag/v1.8.7): 1.8.7 ##### Release Notes ##### Hangfire.Core - **Added** – Allow using macro expressions like `@hourly` for recurring jobs (by [@​MuhamedAbdalla](https://togithub.com/MuhamedAbdalla)). - **Added** – Show storage time in page footer when supported by storage implementation. - **Added** – Show duration and latency columns separately on the Succeeded Jobs page when supported. - **Added** – Show the exception column on the Deleted Jobs page when available and supported by storage. - **Changed** – Reduce package size by stripping unnecessary locales in Moment.js. - **Changed** – Bump Microsoft.Owin package to version 4.2.2. - **Changed** – Log a warning message when a server listens to unsupported queue names. - **Changed** – Use storage time, if available, to show delay warnings in the Dashboard UI. - **Fixed** – Proper rendering of generic arguments on the Job Details page (by [@​olivermue](https://togithub.com/olivermue)). - **Fixed** – Language inconsistency in the Dashboard UI related to date/time description. - **Fixed** – Big stack traces take too long time to be formatted. - **Fixed** – Don't throw `NullReferenceException` from the Scheduled Jobs page when there's a job with missing data. - **Fixed** – Don't throw `NullReferenceException` from the Processing Jobs page when there's a job with missing data. - **Fixed** – CSS for Enqueued and Deleted state cards in dark theme. - **Fixed** – Log errors instead of throwing an exception when a particular table can't be cleaned. - **Fixed** – Avoid logging fatal exceptions when stopping a faulting background process. - **Fixed** – Don't display checkboxes in the Dashboard UI when job details can not be fetched. - **Fixed** – Scrollbars in WebKit-based browsers are now dark in dark mode. - **Project** – Disable tests for `netcoreapp1.0` and `netcoreapp2.1` targets since they aren't supported in AppVeyor. - **Project** – Add a `net6.0` target for unit tests instead of the removed ones. - **Project** – Modernise projects and build environments to use the newest features. ##### Hangfire.SqlServer - **Changed** – Avoid throwing an exception when a connection string has duplicate property names. - **Project** – Disable tests for `netcoreapp1.0` and `netcoreapp2.1` targets since they aren't supported in AppVeyor. - **Project** – Add a `net6.0` target for unit tests instead of the removed ones. - **Project** – Modernise projects and build environments to use the newest features.

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[christopherpickering]

:tada: This PR is included in version 3.15.1 :tada:

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[christopherpickering]

:tada: This PR is included in version 3.15.0-alpha.2 :tada:

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