github: Disable SonarQube's (beta) taint analysis

This does not seem to work on these runners.  Tried setting
dataflowMemoryLimit, but that only seems to affect the analysis (which
causes a warning: "Taint analysis was stopped early due to low memory.
The analysis may not have explored the whole program.") not the
post-processing that evidently causes the runner to get killed due to
OOM (there is no explicit error, but in the debug log we see "The runner
has received a shutdown signal", which apparently can indicate OOM
issues).

.github/workflows/sonarcloud.yml

@@ -65,7 +65,8 @@ jobs:
           args: >
             -Dsonar.projectKey=${{ secrets.SONAR_PROJECT }}
             -Dsonar.organization=${{ secrets.SONAR_ORGANIZATION }}
-            -Dsonar.cfamily.threads=2
+            -Dsonar.cfamily.threads=4
+            -Dsonar.cfamily.taintAnalysis=false
             -Dsonar.cfamily.compile-commands=${{ env.BUILD_WRAPPER_OUT_DIR }}/compile_commands.json
       - run: ccache -sv
       - if: github.event_name == 'push'