Update python-qtconsole to 4.7.5

Summary:
Changelog:

• Print input if there is no prompt.
• Fix completion widget text for paths and files.
• Fix all misuses of QtGui.
• Set updated prompt as previous prompt object in JupyterWidget.
• Fix some Qt incorrect imports.
• Remove common prefix from path completions.
• Use QtWidgets instead of QtGui to create QMenu instances.
• Use qtpy as the shim layer for Python Qt bindings and remove our own shim.
• Add an option to configure scrollbar visibility.
• Set console to read only after input.
• Allow text to be added before the prompt while autocompleting.
• Scroll when adding text even when not executing.
• Fix emoji highlighting.
• Fix error when closing comms.
• Fix prompt automatically scrolling down on execution.
• Improve positioning and content of completion widget.
• Scroll down for output from remote commands.
• Add Comms to qtconsole.
• Add kernel language name as an attribute of JupyterWidget.

Signed-off-by: Algent Albrahimi <algent@protonmail.com>

Test Plan: Run a few python scrips using new version of spyder3.

Reviewers: Triage Team, JoshStrobl

Reviewed By: Triage Team, JoshStrobl

Subscribers: JoshStrobl

Differential Revision: https://dev.getsol.us/D9435