Fix version string included in Coverity submission

.gitlab/coverity.yml

@@ -24,12 +24,13 @@
   echo "Creating tar file of scan results"
   tar cfz cov-int.tar.gz cov-int
   echo "Submitting scan results"
+  export KICAD_VERSION=$(sed 's/[()]//g' kicad_build_version.txt)
   curl -v https://scan.coverity.com/builds?project=$COVERITY_SCAN_PROJECT_NAME \
        --form token=$COVERITY_SCAN_TOKEN \
        --form email=$GITLAB_USER_EMAIL \
        --form file=@cov-int.tar.gz \
-       --form version="`cat kicad_build_version.txt`" \
-       --form description="`cat kicad_build_version.txt` / $CI_COMMIT_TITLE" 2>&1 \
+       --form version="$KICAD_VERSION" \
+       --form description="$KICAD_VERSION / $CI_COMMIT_TITLE" 2>&1 \
         | tee curl-response.txt
   grep -q 'Build successfully submitted' curl-response.txt