dtool: replace rustc-serialize version to unbreak build

[kiike]

Description of changes

This PR adopts the same patch offered in #310125 to unbreak the build with versions of Rust > 1.76. Part of ZHF: #309482

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[kiike]

[...]
dtool>     Finished test [unoptimized + debuginfo] target(s) in 28.90s
dtool> warning: the following packages contain code that will be rejected by a future version of Rust: serde_test v1.0.104
dtool> note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
dtool>      Running unittests src/main.rs (target/x86_64-unknown-linux-gnu/debug/deps/dtool-1df14c63a48c58ba)
dtool> running 19 tests
dtool> test modules::base64::tests::test_cases ... ok
dtool> test modules::base58::tests::test_cases ... ok
dtool> test modules::case::tests::test_cases ... ok
dtool> test modules::eddsa::tests::test_cases ... ok
dtool> test modules::aes::tests::test_cases ... ok
dtool> test modules::hex::tests::test_cases ... ok
dtool> test modules::hex::tests::test_h2b ... ok
dtool> test modules::html::tests::test_cases ... ok
dtool> test modules::number_codec::tests::test_cases ... ok
dtool> test modules::number_system::tests::test_cases ... ok
dtool> test modules::pbkdf2::tests::test_cases ... ok
dtool> test modules::hash::tests::test_cases ... ok
dtool> test modules::re::tests::test_cases ... ok
dtool> test modules::sm4::tests::test_cases ... ok
dtool> test modules::time::tests::test_cases ... ok
dtool> test modules::unicode::tests::test_cases ... ok
dtool> test modules::url::tests::test_cases ... ok
dtool> test modules::srdsa::tests::test_cases ... ok
dtool> test modules::ecdsa::tests::test_cases ... ok
dtool> test result: ok. 19 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.19s
dtool> Finished cargoCheckHook
dtool> Running phase: installPhase
dtool> Executing cargoInstallHook
dtool> Finished cargoInstallHook
dtool> Running phase: fixupPhase
dtool> shrinking RPATHs of ELF executables and libraries in /nix/store/ask7z11cc9zjr4i4gn0i92p3zv0l8rm2-dtool-0.12.0
dtool> shrinking /nix/store/ask7z11cc9zjr4i4gn0i92p3zv0l8rm2-dtool-0.12.0/bin/dtool
dtool> checking for references to /build/ in /nix/store/ask7z11cc9zjr4i4gn0i92p3zv0l8rm2-dtool-0.12.0...
dtool> patching script interpreter paths in /nix/store/ask7z11cc9zjr4i4gn0i92p3zv0l8rm2-dtool-0.12.0
dtool> stripping (with command strip and flags -S -p) in  /nix/store/ask7z11cc9zjr4i4gn0i92p3zv0l8rm2-dtool-0.12.0/bin
 nix shell -L .#dtool
 dtool case
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