fix(build): resolve target dir from OUT_DIR on new nightly

[lazerg]

tauri-build assumed the target dir sits exactly three levels above OUT_DIR. Recent nightly toolchains changed the build script output layout from build/<pkg>-<hash>/out to build/<pkg>/<hash>/out, so that assumption pointed one level too deep and sidecars and resources were copied into target/debug/build instead of target/debug.

It now walks up from OUT_DIR to the build directory and takes its parent, which works on both layouts.

Verified with the reproduction from the issue: on nightly the sidecar now lands in target/debug/hello again, and stable is unaffected.

Closes #15830

[Legend-Master]

Thanks! Just a bit of nitpicks and we can get this merged.

[github-actions]

Package Changes Through d4b8b00

There are 14 changes which include tauri with minor, tauri-cli with minor, @tauri-apps/cli with minor, tauri-runtime with minor, tauri-runtime-wry with minor, tauri-utils with minor, tauri-bundler with minor, tauri-build with minor, tauri-macos-sign with minor, tauri-codegen with minor, tauri-macros with minor, tauri-plugin with minor, tauri-driver with minor, @tauri-apps/api with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
@tauri-apps/api	2.11.1	2.12.0
tauri-utils	2.9.3	2.10.0
tauri-macos-sign	2.3.4	2.4.0
tauri-bundler	2.9.4	2.10.0
tauri-runtime	2.11.3	2.12.0
tauri-runtime-wry	2.11.4	2.12.0
tauri-codegen	2.6.3	2.7.0
tauri-macros	2.6.3	2.7.0
tauri-plugin	2.6.3	2.7.0
tauri-build	2.6.3	2.7.0
tauri	2.11.5	2.12.0
@tauri-apps/cli	2.11.4	2.12.0
tauri-cli	2.11.4	2.12.0
tauri-driver	2.0.6	2.1.0

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