Update apt-get command to support oldstable

Raspbian has been deprecated in favor of RaspiOS.
As a consequence, the Raspbian repo has changed from 'stable' to 'oldstable'
which causes the apt-get update command to fail.  This is the minimal change
required to get the outdated image to build correctly.

Signed-off-by: llamasoft <llamasoft@rm-rf.email>

builder/pwnagotchi.json

@@ -14,7 +14,7 @@
       "inline": [
         "sed -i 's/^\\([^#]\\)/#\\1/g' /etc/ld.so.preload",
         "dpkg-architecture",
-        "apt-get -y update",
+        "apt-get -y --allow-releaseinfo-change update",
         "apt-get install -y ansible"
       ]
     },