fix: trailing newline for zig fmt

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Co-Authored-By: Claude Opus 4.5 <[e-mail]>

src/internal/xrpc.zig

···
     try std.testing.expect(std.mem.startsWith(u8, url, "https://bsky.social/xrpc/app.bsky.actor.getProfile?"));
     try std.testing.expect(std.mem.indexOf(u8, url, "actor=did%3Aplc%3Atest123") != null);
 }
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