Repair requirements.txt

[dl1com]

Reinsert PyQt5 and PyInstaller requirements, although already covered by fbs 1.2.1

[dl1com]

Tests run fine now.

Although these lines makes me a bit nervous:

Collecting PyQt5~=5.12 (from -r requirements.txt (line 2))
  Downloading PyQt5-5.15.9-cp37-abi3-manylinux_2_17_x86_64.whl (8.4 MB)

Collecting PyInstaller~=4.1 (from -r requirements.txt (line 3))
  Downloading pyinstaller-4.10-py3-none-manylinux2014_x86_64.whl (1.5 MB)

So it seems that ~= does not have the intended effect to allow only patch-level updates here.
Perhaps we should stick with exact version pinning (==)?

[t0mpr1c3]

Tests run fine now.

Although these lines makes me a bit nervous:

Collecting PyQt5~=5.12 (from -r requirements.txt (line 2))
  Downloading PyQt5-5.15.9-cp37-abi3-manylinux_2_17_x86_64.whl (8.4 MB)

Collecting PyInstaller~=4.1 (from -r requirements.txt (line 3))
  Downloading pyinstaller-4.10-py3-none-manylinux2014_x86_64.whl (1.5 MB)

So it seems that ~= does not have the intended effect to allow only patch-level updates here. Perhaps we should stick with exact version pinning (==)?

Probably safer. Best to do it in the fbs fork as well.