Fix build warnings on invalid escape sequence

[JoelPasvolsky]

The current patterns' strings' definitions

else:
                pattern = "\%Qubit\* inttoptr \(i64 (\d+) to \%Qubit\*\)"
                qubit = re.search(pattern, str(arg)).groups()[0]

cause SDK build warnings in newer Python versions:

<unknown>:176: SyntaxWarning: invalid escape sequence '\%'
<unknown>:184: SyntaxWarning: invalid escape sequence '\%'

I tested only by running your unit test so you might want to test more.

Also updated sphinx requirements to match current SDK.

[thisac]

LGTM