Declare ink_abi as an expected cfg in new project Cargo.toml template (#2058)

* Declare `ink_abi` as an expected `cfg` in new project `Cargo.toml` template

* Update changelog

Author: davidsemakula

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Validate metadata spec arg against specified ABI for contract build - [#2043](https://github.com/use-ink/cargo-contract/pull/2043)
 - Make metadata spec arg optional for contract build - [#2047](https://github.com/use-ink/cargo-contract/pull/2047)
 - Update Solidity metadata generation to support `SolEncode` and `SolDecode` implementing arbitrary types - [#2048](https://github.com/use-ink/cargo-contract/pull/2048)
+- Declare `ink_abi` as an expected `cfg` in new project `Cargo.toml` template - [#2058](https://github.com/use-ink/cargo-contract/pull/2058)
 
 ## [6.0.0-alpha]
 

crates/build/templates/new/_Cargo.toml

@@ -20,3 +20,9 @@ std = [
 ]
 ink-as-dependency = []
 e2e-tests = []
+
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = [
+    'cfg(ink_abi, values("ink", "sol", "all"))'
+]