Trim west.yml imported repository set (#460) (#462)

Verified by:

1. cd $workspace && \
   rm -rf modules/ && \
   west update && \
   zephyr/scripts/twister -p unit_testing \
      -T bacnet-stack/zephyr/tests/

   Visually verified all tests passed.

Signed-off-by: Greg Shue <greg.shue@outlook.com>

west.yml

@@ -21,7 +21,7 @@
 #     <workspace>
 
 manifest:
-  version: 0.7  # This file uses syntax from west 0.7
+  version: 0.13
 
   remotes:
     - name: bacnet-stack
@@ -41,4 +41,6 @@ manifest:
       revision: v3.2.0
       remote: zephyrproject-rtos
       west-commands: scripts/west-commands.yml
-      import: true
+      import:
+        name-allowlist:
+        - picolibc