borg: relax python3-msgpack dependency.

srcpkgs/borg/template

@@ -1,7 +1,7 @@
 # Template file for 'borg'
 pkgname=borg
 version=1.2.6
-revision=2
+revision=3
 build_style=python3-module
 make_check_args="-k not((benchmark)or(readonly))"
 make_check_target="build/lib.*/borg/testsuite"
@@ -23,6 +23,12 @@ export BORG_LIBLZ4_PREFIX="${XBPS_CROSS_BASE}/usr"
 export BORG_LIBZSTD_PREFIX="${XBPS_CROSS_BASE}/usr"
 export BORG_LIBXXHASH_PREFIX="${XBPS_CROSS_BASE}/usr"
 
+post_extract() {
+	# borg#7851
+	vsed -i '/msgpack/s/<=1.0.5/<=1.0.7/g' setup.py
+	vsed -i '/msgpack/s/<= (1, 0, 5)/<= (1, 0, 7)/g' src/borg/helpers/msgpack.py
+}
+
 post_install() {
 	vlicense LICENSE