Handle Rust >= 1.91 change of target-pointer-width JSON type
#2131
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If an ink! contract is currently compiled with
cargo +nightly contract buildit will fail with this error:This is due to this change: rust-lang/rust#144443.
This PR makes sure that whatever toolchain someone uses, the type in the JSON is transformed accordingly.
Once 1.91 is released, we can ask PolkaVM to increase the MSRV, revert the changes in this PR and raise the MSRV here as well.