Update alpinefunction to latest watchdog

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

sample-functions/AlpineFunction/Dockerfile

 FROM alpine:3.8
 
 RUN apk --no-cache add curl \
-    && curl -sL https://github.com/openfaas/faas/releases/download/0.9.6/fwatchdog > /usr/bin/fwatchdog \
+    && curl -sL https://github.com/openfaas/faas/releases/download/0.9.14/fwatchdog > /usr/bin/fwatchdog \
     && chmod +x /usr/bin/fwatchdog
 
 # Populate example here