Update syncthru library to fix issue (#25924)

homeassistant/components/syncthru/manifest.json

@@ -3,7 +3,7 @@
   "name": "Syncthru",
   "documentation": "https://www.home-assistant.io/components/syncthru",
   "requirements": [
-    "pysyncthru==0.4.2"
+    "pysyncthru==0.4.3"
   ],
   "dependencies": [],
   "codeowners": ["@nielstron"]

requirements_all.txt

@@ -1422,7 +1422,7 @@ pysuez==0.1.17
 pysupla==0.0.3
 
 # homeassistant.components.syncthru
-pysyncthru==0.4.2
+pysyncthru==0.4.3
 
 # homeassistant.components.tautulli
 pytautulli==0.5.0