file: bump version and use official upstream instead of Debian

Debian is a bit too volatile.

package/file/file.mk

@@ -3,9 +3,9 @@
 # file
 #
 #############################################################
-FILE_VERSION:=4.24
-FILE_SOURCE:=file_$(FILE_VERSION).orig.tar.gz
-FILE_SITE:=$(BR2_DEBIAN_MIRROR)/debian/pool/main/f/file
+FILE_VERSION:=4.26
+FILE_SOURCE:=file-$(FILE_VERSION).tar.gz
+FILE_SITE:=ftp://ftp.astron.com/pub/file/
 FILE_SOURCE_DIR:=$(BUILD_DIR)/file-$(FILE_VERSION)
 FILE_DIR1:=$(TOOL_BUILD_DIR)/file-$(FILE_VERSION)-host
 FILE_DIR2:=$(BUILD_DIR)/file-$(FILE_VERSION)-target