Silence false positive clang-analyzer warning in repl.cc

The clang-analyzer incorrectly flags a use-after-free for GC-managed objects
when used with std::unique_ptr. Since NixRepl inherits from gc, its memory
is properly managed by Boehm GC and this is a false positive.

Added NOLINTNEXTLINE directive to suppress the warning.

src/libcmd/repl.cc

@@ -917,6 +917,7 @@ ReplExitStatus AbstractNixRepl::runSimple(
         return values;
     };
     LookupPath lookupPath = {};
+    // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDelete)
     auto repl = std::make_unique<NixRepl>(
             lookupPath,
             openStore(),