Update psutil to 5.7.3

[pyup-bot]

This PR updates psutil from 5.7.0 to 5.7.3.

Changelog

5.7.3

=====

2020-10-23

**Enhancements**

- 809_: [FreeBSD] add support for `Process.rlimit()`.
- 893_: [BSD] add support for `Process.environ()` (patch by Armin Gruner)
- 1830_: [UNIX] `net_if_stats()`'s `isup` also checks whether the NIC is
running (meaning Wi-Fi or ethernet cable is connected).  (patch by Chris Burger)
- 1837_: [Linux] improved battery detection and charge "secsleft" calculation
(patch by aristocratos)

**Bug fixes**

- 1620_: [Linux] physical cpu_count() result is incorrect on systems with more
than one CPU socket.  (patch by Vincent A. Arcila)
- 1738_: [macOS] Process.exe() may raise FileNotFoundError if process is still
alive but the exe file which launched it got deleted.
- 1791_: [macOS] fix missing include for getpagesize().
- 1823_: [Windows] Process.open_files() may cause a segfault due to a NULL
pointer.
- 1838_: [Linux] sensors_battery(): if `percent` can be determined but not
the remaining values, still return a result instead of None.
(patch by aristocratos)

5.7.2

=====

2020-07-15

**Bug fixes**

- wheels for 2.7 were inadvertently deleted.

5.7.1

=====

2020-07-15

**Enhancements**

- 1729_: parallel tests on UNIX (make test-parallel). They're twice as fast!
- 1741_: "make build/install" is now run in parallel and it's about 15% faster
on UNIX.
- 1747_: `Process.wait()` on POSIX returns an enum, showing the negative signal
which was used to terminate the process::
 >>> import psutil
 >>> p = psutil.Process(9891)
 >>> p.terminate()
 >>> p.wait()
 <Negsignal.SIGTERM: -15>
- 1747_: `Process.wait()` return value is cached so that the exit code can be
retrieved on then next call.
- 1747_: Process provides more info about the process on str() and repr()
(status and exit code)::
 >>> proc
 psutil.Process(pid=12739, name='python3', status='terminated',
                exitcode=<Negsigs.SIGTERM: -15>, started='15:08:20')
- 1757_: memory leak tests are now stable.
- 1768_: [Windows] added support for Windows Nano Server. (contributed by
Julien Lebot)

**Bug fixes**

- 1726_: [Linux] cpu_freq() parsing should use spaces instead of tabs on ia64.
(patch by Michał Górny)
- 1760_: [Linux] Process.rlimit() does not handle long long type properly.
- 1766_: [macOS] NoSuchProcess may be raised instead of ZombieProcess.
- 1781_: fix signature of callback function for getloadavg().  (patch by
Ammar Askar)

Links

• PyPI: https://pypi.org/project/psutil
• Changelog: https://pyup.io/changelogs/psutil/
• Repo: https://github.com/giampaolo/psutil

[pyup-bot]

Closing this in favor of #1410