CI: update to kas 4.3.2

The new kas version has fixed the netrc issue.  Update to it and remove
the workaround

Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -1,4 +1,4 @@
-image: ${MIRROR_GHCR}/siemens/kas/kas:4.3.1
+image: ${MIRROR_GHCR}/siemens/kas/kas:4.3.2
 
 variables:
   # These are needed as the k8s executor doesn't respect the container

ci/check-warnings

@@ -7,7 +7,7 @@ set -e -u
 
 LOGFILE=$1
 
-LINES=$(sed -e "/attempting MIRRORS if available/d" -e "/Error parsing .*netrc:/d" $LOGFILE | wc -l)
+LINES=$(grep --invert-match "attempting MIRRORS if available" $LOGFILE | wc -l)
 if test "$LINES" -ne 0; then
     echo ==============================
     echo The build had warnings/errors: