Change to SPDX license identifier

https://github.com/oneapi-src/oneDNN/blob/v3.4.1/LICENSE

PKGBUILD

@@ -10,7 +10,7 @@ arch=(x86_64)
 replaces=('intel-dnnl' 'mkl-dnn')
 provides=('intel-dnnl' 'mkl-dnn')
 url=https://github.com/oneapi-src/oneDNN
-license=('APACHE')
+license=('Apache-2.0')
 depends=('gcc-libs')
 makedepends=('cmake' 'ninja')
 source=("$pkgname-$pkgver.tar.gz::https://github.com/oneapi-src/oneDNN/archive/v${pkgver}.tar.gz")