build: downgrade to sauce-connect v4.5.1 (#28659) (#15183)

We currently face a lot of flakiness with our Saucelabs job. These randomly exceed the 2min establish timeout because something throws
off `sauce-connect` in a long-lasting loop where it tries to connect to some of their Saucelabs servers. The initial assumption from the Saucelabs
team was that we might have some invalid firewall rules, but this does not answer why this happens _randomly_, so the latest update from the support
is that there have been some changes in the latest version of `sauce-connect` version that cause this flakiness.

Author: devversion

scripts/saucelabs/start-tunnel.sh

@@ -2,7 +2,7 @@
 
 set -e -o pipefail
 
-tunnelFileName="sc-4.5.3-linux.tar.gz"
+tunnelFileName="sc-4.5.1-linux.tar.gz"
 tunnelUrl="https://saucelabs.com/downloads/${tunnelFileName}"
 
 tunnelTmpDir="/tmp/material-saucelabs"