package/squashfs: update URL to source archive after Github changes

The squashfs 4.6.1 archive hash has been changed suddenly two weeks
ago by Github without any intended changes from the squashfs maintainer
[1].

The orginal squashfs 4.6.1 archive has been manually uploaded again.

Update the URL to download the archive that match the expected hash.

Since we don't use the github download helper anymore, the squashfs
archive name is changed from squashfs-4.6.1.tar.gz to
squashfs-tools-4.6.1.tar.gz.

Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/10355448207
(and many more...)

See:
[1] https://github.com/plougher/squashfs-tools/issues/313

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/squashfs/squashfs.hash

@@ -1,5 +1,5 @@
 # Locally computed
-sha256  94201754b36121a9f022a190c75f718441df15402df32c2b520ca331a107511c  squashfs-4.6.1.tar.gz
+sha256  94201754b36121a9f022a190c75f718441df15402df32c2b520ca331a107511c  squashfs-tools-4.6.1.tar.gz
 
 # License files
 sha256  8177f97513213526df2cf6184d8ff986c675afb514d4e68a404010521b880643  COPYING

package/squashfs/squashfs.mk

@@ -5,7 +5,8 @@
 ################################################################################
 
 SQUASHFS_VERSION = 4.6.1
-SQUASHFS_SITE = $(call github,plougher,squashfs-tools,$(SQUASHFS_VERSION))
+SQUASHFS_SOURCE = squashfs-tools-$(SQUASHFS_VERSION).tar.gz
+SQUASHFS_SITE = https://github.com/plougher/squashfs-tools/releases/download/$(SQUASHFS_VERSION)
 SQUASHFS_LICENSE = GPL-2.0+
 SQUASHFS_LICENSE_FILES = COPYING
 SQUASHFS_CPE_ID_VALID = YES