Revert "fix: test_sec_audit: ignore cargo audit output"

This reverts commit d761b01. The output
to stdout was fixed in cargo audit 0.21.2, so if we rebuild the docker
container the grep is no longer necessary.

In fact, the grep has broken this test in our nightly pipeline because
it overwrites the return code of cargo audit itself, meaning the non-PR
version of this test (which is supposed to fail if there exist any cargo
audit warnings) was never failing.

(cherry picked from commit 1d98a21)
Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/integration_tests/security/test_sec_audit.py

@@ -35,6 +35,6 @@ def set_of_vulnerabilities(output: CommandReturn):
         )
 
     git_ab_test_host_command_if_pr(
-        "cargo audit --deny warnings -q --json |grep -Po '{.*}'",
+        "cargo audit --deny warnings -q --json",
         comparator=set_did_not_grow_comparator(set_of_vulnerabilities),
     )