[FIX] Fix line plot's send_report

[PrimozGodec]

Issue

Send line plot's send report fails with pyqtgraph==0.10.0.

Traceback (most recent call last):
  File "/Users/primoz/miniconda3/envs/orange3/lib/python3.8/site-packages/pyqtgraph/graphicsItems/PlotCurveItem.py", line 183, in boundingRect
    px, py = self.pixelVectors()
  File "/Users/primoz/miniconda3/envs/orange3/lib/python3.8/site-packages/pyqtgraph/graphicsItems/GraphicsItem.py", line 251, in pixelVectors
    dti = fn.invertQTransform(dt)
  File "/Users/primoz/miniconda3/envs/orange3/lib/python3.8/site-packages/pyqtgraph/functions.py", line 2199, in invertQTransform
    inv = numpy.linalg.inv(arr)
  File "<__array_function__ internals>", line 5, in inv
  File "/Users/primoz/miniconda3/envs/orange3/lib/python3.8/site-packages/numpy/linalg/linalg.py", line 546, in inv
    ainv = _umath_linalg.inv(a, signature=signature, extobj=extobj)
  File "/Users/primoz/miniconda3/envs/orange3/lib/python3.8/site-packages/numpy/linalg/linalg.py", line 88, in _raise_linalgerror_singular
    raise LinAlgError("Singular matrix")
numpy.linalg.LinAlgError: Singular matrix

The error was discovered while testing orange3-installers https://github.com/ales-erjavec/orange3-installers/runs/1224911463

Description of changes

The bug was fixed in pyqtgraph==0.11.0 so increasing the minimum version of pyqtgraph.
pyqtgraph fix: pyqtgraph/pyqtgraph#1173

Includes

• Code changes
• Tests
• Documentation

[codecov]

Codecov Report

Merging #5018 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5018      +/-   ##
==========================================
+ Coverage   84.61%   84.65%   +0.04%     
==========================================
  Files         285      285              
  Lines       59508    59508              
==========================================
+ Hits        50353    50378      +25     
+ Misses       9155     9130      -25