chore: make CI green again

lib/saucelabs/start_tunnel.sh

@@ -11,7 +11,7 @@ set -e
 # Curl and run this script as part of your .travis.yml before_script section:
 # before_script:
 #   - curl https://gist.github.com/santiycr/5139565/raw/sauce_connect_setup.sh | bash
-SC_VERSION="4.5.2"
+SC_VERSION="4.5.4"
 CONNECT_URL="https://saucelabs.com/downloads/sc-$SC_VERSION-linux.tar.gz"
 CONNECT_DIR="/tmp/sauce-connect-$RANDOM"
 CONNECT_DOWNLOAD="sc-$SC_VERSION-linux.tar.gz"

scripts/travis/build.sh

@@ -11,11 +11,12 @@ export SAUCE_ACCESS_KEY
 BROWSER_STACK_ACCESS_KEY=$(echo "$BROWSER_STACK_ACCESS_KEY" | rev)
 SAUCE_ACCESS_KEY=$(echo "$SAUCE_ACCESS_KEY" | rev)
 
-# The currently latest version of Safari on Saucelabs (v12) is unstable and disconnects frequently.
-# TODO: Add `SL_Safari` back, once/if it becomes more stable again.
+# The currently latest-1 version of desktop Safari on Saucelabs (v12.0) is unstable and disconnects
+# consistently. The latest version (v12.1) works fine.
+# TODO: Add `SL_Safari-1` back, once it no longer corresponds to v12.0.
 BROWSERS="SL_Chrome,SL_Chrome-1,\
 SL_Firefox,SL_Firefox-1,\
-SL_Safari-1,\
+SL_Safari,\
 SL_iOS,SL_iOS-1,\
 SL_IE_9,SL_IE_10,SL_IE_11,\
 SL_EDGE,SL_EDGE-1"