Bump pyinstaller from 3.3.1 to 3.6 in /build_files

[dependabot]

Bumps pyinstaller from 3.3.1 to 3.6.

Release notes

Sourced from pyinstaller's releases.

v3.6

See https://pyinstaller.readthedocs.io/en/v3.6/CHANGES.html for Changelog.

v3.5

See https://pyinstaller.readthedocs.io/en/v3.5/CHANGES.html for Changelog.

v3.4

See https://pyinstaller.readthedocs.io/en/v3.4/CHANGES.html for Changelog.

Changelog

Sourced from pyinstaller's changelog.

Changelog for PyInstaller 3.0 – 3.6

3.6 (2020-01-09)

Important: This is the last release of PyInstaller supporting Python 2.7. Python 2 is end-of-life, many packages are about to drop support for Python 2.7 <https://python3statement.org/>_ - or already did it.

Security

* [SECURITY] (Win32) Fix CVE-2019-16784: Local Privilege Escalation caused by
  insecure directory permissions of sys._MEIPATH. This security fix effects all
  Windows software frozen by PyInstaller in "onefile" mode.
  While PyInstaller itself was not vulnerable, all Windows software frozen
  by PyInstaller in "onefile" mode is vulnerable.
If you are using PyInstaller to freeze Windows software using "onefile"
mode, you should upgrade PyInstaller and rebuild your software.
Features

• (Windows): Applications built in windowed mode have their debug messages sent to any attached debugger or DebugView instead of message boxes. (:issue:4288)
• Better error message when file exists at path we want to be dir. (:issue:4591)

Bugfix

* (Windows) Allow usage of `VSVersionInfo` as version argument to EXE again.
  (:issue:`4381`, :issue:`4539`)
* (Windows) Fix MSYS2 dll's are not found by modulegraph. (:issue:`4125`,
  :issue:`4417`)
* (Windows) The temporary copy of bootloader used add resources, icons, etc.
  is not created in --workpath instead of in  %TEMP%. This fixes issues on
  systems where the anti-virus cleans %TEMP% immediately. (:issue:`3869`)
* Do not fail the build when ``ldconfig`` is missing/inoperable.
  (:issue:`4261`)
* Fixed loading of IPython extensions. (:issue:`4271`)
* Fixed pre-find-module-path hook for `distutils` to be compatible with
  `virtualenv >= 16.3`. (:issue:`4064`, :issue:`4372`)
* Improve error reporting when the Python library can't be found.
</tr></table> 

... (truncated)

Commits

• 6d4cce1 Release 3.6.
• 9649913 Doc: Rebuild man-pages for release 3.6.
• 51bcee4 Update versions in README.
• 3058682 Update CREDITS for release 3.6
• 2232b5b Preparing release 3.6
• 95ff39d pyproject.toml: Update config for towncrier.
• 0d7ac32 Hooks: Fix numpy and scipy hooks to find dlls in extra locations.
• 2c16311 Hooks: Add hook for sklearn.mixture.
• 9882f87 Add more options to funding.yml.
• ddec556 Tests/CI: Use new label in .pyup.yml.
• Additional commits viewable in compare view

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