Updates borger: 7da315d Set a special lockfile for continuous mode

diff --git a/borger b/borger
index cccafbca59c9076ad82c1a01187e4aa054ddd71e..7da315d06d515a7d666f7b36bd6ed37f377f75c3 160000 (submodule)
--- a/borger
+++ b/borger
@@ -1 +1 @@
-Subproject commit cccafbca59c9076ad82c1a01187e4aa054ddd71e
+Subproject commit 7da315d06d515a7d666f7b36bd6ed37f377f75c3