Fix syntax warning about an invalid escape sequence #84
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With Python 3.12, invalid escape sequences like `\.` in string literals
cause a syntax warning:
```
service/backend/_utils.py:46: SyntaxWarning: invalid escape sequence '\.'
version = re.sub("\.r[0-9]+$", "", version)
```
Fix this by using the raw string notation instead.
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With Python 3.12, invalid escape sequences like
\.in string literals cause a syntax warning:Fix this by using the raw string notation instead.