qtshadertools(0.2.5): disable SBOM generation (cross-compile)

Qt 6.11 SBOM install fails referencing qtbase SBOM docs during
cross-compile. SBOM is metadata only — no impact on libs/binaries.

local/recipes/qt/qtshadertools/recipe.toml

@@ -250,6 +250,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DQT_BUILD_TOOLS_BY_DEFAULT=OFF \
+    -DQT_GENERATE_SBOM=OFF \
     -DBUILD_SHARED_LIBS=ON \
     -DBUILD_TESTING=OFF \
     -DBUILD_EXAMPLES=OFF \