fix: raw_call type when max_outsize=0 is set

[charles-cooper]

prior to this commit, when raw_call is used with max_outsize explicitly set to 0 (max_outsize=0) the compiler incorrectly infers that raw_call has no return type

@external
@payable
def foo(_target: address):
    # compiles
    a: bool = raw_call(_target, method_id("foo()"), revert_on_failure=False)
    # should have same behavior, but prior to this commit does not compile:
    b: bool = raw_call(_target, method_id("foo()"), max_outsize=0, revert_on_failure=False)

chainsec june 2023 review 5.16

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Codecov Report

Merging #3572 (0336745) into master (43c8d85) will decrease coverage by 0.07%.
Report is 9 commits behind head on master.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #3572      +/-   ##
==========================================
- Coverage   89.13%   89.06%   -0.07%     
==========================================
  Files          85       85              
  Lines       11365    11369       +4     
  Branches     2585     2584       -1     
==========================================
- Hits        10130    10126       -4     
- Misses        813      820       +7     
- Partials      422      423       +1     

Files Changed	Coverage Δ
vyper/builtins/functions.py	90.46% <100.00%> (+0.07%)	⬆️

... and 7 files with indirect coverage changes

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