Update okio to v3.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.squareup.okio:okio-fakefilesystem	3.9.0 -> 3.9.1
com.squareup.okio:okio	3.9.0 -> 3.9.1

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Release Notes

square/okio (com.squareup.okio:okio-fakefilesystem)

v3.9.1

2024-09-12

• Fix: Support paths containing a single dot (".") in Path.relativeTo.
• Fix: Do not read from the upstream source when a 0-byte read is requested.
• Fix: Update kotlinx.datetime to 0.6.0 to correct a Gradle module metadata problem with 0.5.0.
  Note: this artifact is only used in 'okio-fakefilesystem' and 'okio-nodefilesystem' and not in the Okio core.

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