Increasing required version for The Walrus

[antalszava]

Increasing the required version for The Walrus such that the newest features are available.

[codecov[bot]]

Codecov Report

Merging #380 into master will decrease coverage by 9.98%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #380      +/-   ##
==========================================
- Coverage   97.76%   87.77%   -9.99%     
==========================================
  Files          52       52              
  Lines        6387     6387              
==========================================
- Hits         6244     5606     -638     
- Misses        143      781     +638     

Impacted Files	Coverage Δ
strawberryfields/backends/fockbackend/circuit.py	14.77% <0.00%> (-83.65%)	:arrow_down:
strawberryfields/backends/fockbackend/backend.py	33.08% <0.00%> (-66.92%)	:arrow_down:
strawberryfields/backends/fockbackend/ops.py	30.85% <0.00%> (-61.15%)	:arrow_down:
strawberryfields/backends/states.py	59.79% <0.00%> (-37.19%)	:arrow_down:
strawberryfields/utils.py	86.00% <0.00%> (-13.00%)	:arrow_down:

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[antalszava]

@josh146 thanks for getting that! How come we are pinning in setup.py?

[josh146]

@josh146 thanks for getting that! How come we are pinning in setup.py?

While not essential, this is mostly for users upgrading Strawberry Fields versions; it ensures that The Walrus is also upgraded.