profiles: prpl_core: feed-amx: libamxb: [dmproxy][amx timeouts] Replace synchronous describe call from dmproxy [fix]

Integrates following changes:
- subscription: Add remote subscription index vs. named test [fix] (3b384f41)
- subscription: Add remote subscription index vs. named test [fix] (a9fd8124)
- [dmproxy][amx timeouts] Replace synchronous describe call from dmproxy (6d71b1df)

References: PPW-1048

Signed-off-by: FAOUZI YAHYA <faouzi.yahya_ext@softathome.com>

profiles/prpl_core.yml

@@ -3,7 +3,7 @@ description: A minimal set of prpl packages and configs (no WAN support, no LCM,
 feeds:
   - name: feed_amx
     uri: https://gitlab.com/prpl-foundation/prplos/feeds/feed_amx.git
-    revision: main@0d0a3dc387358ed966a392424669e20c6eaf777c
+    revision: main@6b4bf26f3e85029822b3259aa6cc91a36dad426e
 
   - name: feed_prplmesh
     uri: https://gitlab.com/prpl-foundation/prplos/feeds/feed-prplmesh.git