chore(deps): Update dirs requirement from 4 to 5 (#262)

Updates the requirements on [dirs](/~https://github.com/soc/dirs-rs) to
permit the latest version.
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Cargo.toml

@@ -28,7 +28,7 @@ anyhow = "1"
 backon = "0.4"
 base64 = "0.21"
 bytes = "1"
-dirs = "4"
+dirs = "5"
 form_urlencoded = "1"
 hex = "0.4"
 hmac = "0.12"