Fix a SyntaxWarning caused by invalid escape sequences
#1103
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The warning is thrown when Python imports the file,
and manifests in the test suite with this error:
```
jwt/api_jwt.py:326
/home/runner/work/pyjwt/pyjwt/jwt/api_jwt.py:326: SyntaxWarning: invalid escape sequence '\*'
(e.g. HS\* and RS\*).
```
(This manifests as a `DeprecationWarning` as well,
depending on the Python interpreter and version.)
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auvipy
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Oct 22, 2025
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The warning is thrown when Python imports the file, and manifests in the test suite with this error [recent CI example]:
(This manifests as a
DeprecationWarningas well, depending on the Python interpreter and version.)