Problem: upgrade to serde 1.0.119 fails to compile

[tomtau]

   Compiling client-core v0.6.0 (/home/runner/work/thaler/thaler/client-core)
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error[E0603]: module `export` is private
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Error:    --> client-core/src/service/wallet_service.rs:17:12
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    |
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17  | use serde::export::PhantomData;
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    |            ^^^^^^ private module
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    |
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note: the module `export` is defined here
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   --> /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/serde-1.0.119/src/lib.rs:275:5
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    |
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275 | use self::__private as export;
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[tomtau]

https://github.com/crypto-com/thaler/pull/2447/checks?check_run_id=1683912819#step:6:904