scripts/coverity-scan/COMPONENTS.md: Update slirp component info

Update the regex for the slirp component now that it lives
solely inside /slirp/, and note that it should be ignored in
Coverity analysis (because it's a separate upstream project
now, and they run Coverity on it themselves).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20220718142310.16013-3-peter.maydell@linaro.org

scripts/coverity-scan/COMPONENTS.md

@@ -108,8 +108,8 @@ qemu-ga
 scsi
   ~ (/qemu)?(/scsi/.*|/hw/scsi/.*|/include/hw/scsi/.*)
 
-slirp
-  ~ (/qemu)?(/.*slirp.*)
+slirp (component should be ignored in analysis)
+  ~ (/qemu)?(/slirp/.*)
 
 tcg
   ~ (/qemu)?(/accel/tcg/.*|/replay/.*|/(.*/)?softmmu.*)