Update okioVersion to v3.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.okio:okio-fakefilesystem	3.17.0 → 3.18.0
com.squareup.okio:okio	3.17.0 → 3.18.0

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Release Notes

lysine-dev/okio (com.squareup.okio:okio-fakefilesystem)

v3.18.0

2026-07-21

• Fix: Use wide character APIs to better support of non-UTF-8 filesystems on Windows.
• Fix: Don't crash in AssetFileSystem.exists() when the underlying storage throws a
  FileNotFoundException.
• Fix: Load WASI paths relative to their preopen. The platform behavior recently changed in
  NodeJS, causing our WasiFileSystem to be unable to access files!
• New: Optionally ignore whitespace when decoding hexadecimal.
• New: Optionally omit padding when encoding Base64.
• New: BufferedSource.readUInt(), BufferedSink.writeUInt(), and similar functions for UByte,
  UShort and ULong. Also add support for unsigned and little-endian.
• New: BufferedSink.utf8Appendable(). Use this to adapt an Okio sink to an Appendable.
• New: Source.limit() returns a wrapped source with a strict limit on how many bytes are
  returned.
• New: ByteString.equals(other, constantTime) for subtle defense against timing attacks.

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[github-actions]

OLD: app-madani-debug.apk (signature: V1, V2)
NEW: app-madani-debug.apk (signature: V1, V2)

          │            compressed             │           uncompressed            
          ├───────────┬───────────┬───────────┼───────────┬───────────┬───────────
 APK      │ old       │ new       │ diff      │ old       │ new       │ diff      
──────────┼───────────┼───────────┼───────────┼───────────┼───────────┼───────────
      dex │  25.1 MiB │  25.2 MiB │  +6.8 KiB │  64.3 MiB │  64.3 MiB │ +12.3 KiB 
     arsc │   2.4 MiB │   2.4 MiB │       0 B │   2.4 MiB │   2.4 MiB │       0 B 
 manifest │     6 KiB │     6 KiB │       0 B │  28.5 KiB │  28.5 KiB │       0 B 
      res │   1.8 MiB │   1.8 MiB │       0 B │   2.1 MiB │   2.1 MiB │       0 B 
   native │   194 KiB │ 180.3 KiB │ -13.7 KiB │    63 KiB │    63 KiB │       0 B 
    asset │   1.8 MiB │   1.8 MiB │       0 B │   4.1 MiB │   4.1 MiB │       0 B 
    other │ 226.7 KiB │ 226.7 KiB │      +9 B │ 563.4 KiB │ 563.4 KiB │       0 B 
──────────┼───────────┼───────────┼───────────┼───────────┼───────────┼───────────
    total │  31.6 MiB │  31.6 MiB │  -6.8 KiB │  73.5 MiB │  73.6 MiB │ +12.3 KiB 

[github-actions]

Upgraded Dependencies
com.squareup.okio:okio:3.18.0, (changed from 3.17.0)
com.squareup.okio:okio-jvm:3.18.0, (changed from 3.17.0)