scripts/bootstrap.sh: use isl25

ref commit 1b3d450d (main/gcc: build against isl25)
ref commit a7825745 (main/isl25: new aport)
ref commit 069b35f9 (main/isl24: remove -dev)

scripts/bootstrap.sh

@@ -117,7 +117,7 @@ fi
 # ordered cross-build
 for PKG in fortify-headers linux-headers musl libc-dev pkgconf zlib \
 	   openssl ca-certificates libmd \
-	   gmp mpfr4 mpc1 isl24 cloog libucontext binutils gcc \
+	   gmp mpfr4 mpc1 isl25 cloog libucontext binutils gcc \
 	   libbsd libretls busybox make \
 	   apk-tools file \
 	   libcap openrc alpine-conf alpine-baselayout alpine-keys alpine-base patch build-base \