update splunk installer URL and version

demo/splunk/wazuh_cf_splunk.sh

@@ -24,10 +24,10 @@ systemctl restart sshd
 yum install net-tools wget git curl -y -q
 
 # download splunk
-wget -O splunk-7.2.3-06d57c595b80-linux-2.6-x86_64.rpm 'https://www.splunk.com/bin/splunk/DownloadActivityServlet?architecture=x86_64&platform=linux&version=7.2.3&product=splunk&filename=splunk-7.2.3-06d57c595b80-linux-2.6-x86_64.rpm&wget=true' &> /dev/null
+wget -O splunk-7.3.5-86fd62efc3d7-linux-2.6-x86_64.rpm 'https://wazuh-demo.s3-us-west-1.amazonaws.com/splunk-7.3.5-86fd62efc3d7-linux-2.6-x86_64.rpm' &> /dev/null
 
 # install splunk
-yum install splunk-7.2.3-06d57c595b80-linux-2.6-x86_64.rpm -y &> /dev/null
+yum install splunk-7.3.5-86fd62efc3d7-linux-2.6-x86_64.rpm -y &> /dev/null
 
 # add admin user
 echo "[user_info]" > /opt/splunk/etc/system/local/user-seed.conf