Update to uStreamer 5.43 (#15)

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Dockerfile

@@ -37,7 +37,7 @@ EOF
 ARG TARGETPLATFORM
 
 ARG PKG_NAME='ustreamer'
-ARG PKG_VERSION='5.38'
+ARG PKG_VERSION='5.43'
 
 # This should be a timestamp, formatted `YYYYMMDDhhmmss`. That way the package
 # manager always installs the most recently built package.