[hooks_runner] Add LIBCLANG_PATH to environment variable allowlist

[GregoryConrad]

Certain Rust projects utilize bindgen to generate Rust bindings from C headers. bindgen in turn uses clang-sys, which utilizes libclang's shared library (much like Dart's ffigen, AFAIK). clang-sys looks in a few default locations for this shared library, but is not always able to find it. In such situations (e.g., in a Nix-based install), the developer must set LIBCLANG_PATH to point to the shared library's location.

Thus, adding this variable to the allowlist.

CC @dcharkes

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Breaking changes ✔️

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[coveralls]

coverage: 82.006% (-10.0%) from 91.972%
when pulling 1cdf57b on GregoryConrad:patch-1
into f7c7d52 on dart-lang:main.

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Package publishing

Package	Version	Status	Publish tag (post-merge)
package:code_assets	0.19.8	already published at pub.dev
package:data_assets	0.19.3	already published at pub.dev
package:ffi	2.1.5-wip	WIP (no publish necessary)
package:hooks	0.20.4	already published at pub.dev
package:hooks_runner	0.23.2	ready to publish	hooks_runner-v0.23.2
package:native_toolchain_c	0.17.2	already published at pub.dev
package:swift2objc	0.1.0	already published at pub.dev
package:swiftgen	0.1.1	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.