Properly pin dependencies

[puzzleshark]

No description provided.

[antalszava]

Hi @puzzleshark, there seems to be an issue with some tests, e.g., https://github.com/PennyLaneAI/pennylane-sf/runs/7011068931?check_suite_focus=true#step:5:40

Also, in requirements-ci.txt, we should be able to get away with listing only the most important packages (see for example the same file for the PennyLane-Qiskit package).

[codecov]

Codecov Report

Merging #112 (fe3b515) into master (8da1571) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #112   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          498       498           
=========================================
  Hits           498       498           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8da1571...fe3b515. Read the comment docs.

[antalszava]

Looks good! 👍 Thanks :)