Update test fixture after change in S3 bucket permissions (#2048)

S3 directory listing permissions were removed from the buildpack's S3
bucket, which means non-existent files now return 403 rather than 404.

The implementation for error handling already works with both:
https://github.com/heroku/heroku-buildpack-python/blob/855d7e66d99357f814f74a1e0920f6c0f377f64f/lib/python.sh#L74-L76

However, the test assertion needs to be loosened to resolve this CI
failure:
https://github.com/heroku/heroku-buildpack-python/actions/runs/22640940619/job/65680836050#step:5:497

GUS-W-21443369.

Author: edmorley

spec/hatchet/python_version_spec.rb

@@ -527,7 +527,7 @@
           remote: -----> Python app detected
           remote: -----> Using Python 3.12.999 specified in .python-version
           remote: -----> Installing Python 3.12.999
-          remote:        curl: \\(22\\) The requested URL returned error: 404.*
+          remote:        curl: \\(22\\) The requested URL returned error: .+
           remote:        zstd: /\\*stdin\\*\\\\: unexpected end of file 
           remote:        tar: Child returned status 1
           remote:        tar: Error is not recoverable: exiting now