Chore: Update serde_with crate version to 3.14.0

[Xynnn007]

This is a dependency update PR. The old version makes our downstream project some compilation error.
I hope it makes sense to update the denpendency version.

error: failed to select a version for `serde_with`.
    ... required by package `attester v0.1.0 (https://github.com/confidential-containers/guest-components.git?rev=591d0bb#591d0bb4)`
    ... which satisfies git dependency `attester` of package `kbs_protocol v0.1.0 (https://github.com/confidential-containers/guest-components.git?rev=591d0bb#591d0bb4)`
    ... which satisfies git dependency `kbs_protocol` of package `kbs-client v0.1.0 (/home/kbs/tools/kbs-client)`
    ... which satisfies path dependency `kbs-client` (locked to 0.1.0) of package `integration-tests v0.1.0 (/home/kbs/integration-tests)`
versions that meet the requirements `^3.14.0` are: 3.14.0

all possible versions conflict with previously selected packages.

error: failed to select a version for `serde_with`.
    ... required by package `veraison-apiclient v0.0.2 (https://github.com/veraison/rust-apiclient?branch=trustee-cca#4f5facf8)`
    ... which satisfies git dependency `veraison-apiclient` (locked to 0.0.2) of package `verifier v0.1.0 (/home/kbs/deps/verifier)`
    ... which satisfies path dependency `verifier` (locked to 0.1.0) of package `attestation-service v0.1.0 (/home/kbs/attestation-service)`
    ... which satisfies path dependency `attestation-service` (locked to 0.1.0) of package `integration-tests v0.1.0 (/home/kbs/integration-tests)`