Use SPDX license identifier

LICENSE from https://github.com/php/php-src/blob/master/LICENSE

SPDX identifier from https://spdx.org/licenses/

PKGBUILD

@@ -21,7 +21,7 @@ pkgname=('php'
 pkgver=8.3.3
 pkgrel=1
 arch=('x86_64')
-license=('PHP')
+license=('PHP-3.01')
 url='https://www.php.net/'
 makedepends=('apache' 'aspell' 'enchant' 'gd' 'gmp' 'icu' 'libsodium' 'libxslt' 'libzip' 'net-snmp'
              'postgresql-libs' 'sqlite' 'systemd' 'tidy' 'unixodbc' 'curl' 'libtool' 'postfix' 'freetds' 'pcre2'