Fix (unreported) LSAN suppression list removing almost all (valid!) errors.

The last supression rule (`leak:libasan*`) would match almost all
detected cases, since the first line is almost always something like
that:
  #0 0x7f71040d85bf in __interceptor_malloc ../../../../src/libsanitizer/asan/asan_malloc_linux.cpp:69

Not sure if that was already the case when this suppression rule was
added, or if things changed in newer versions of ASAN/LSAN...

tools/config/analysis/lsan.supp

@@ -1,5 +1,6 @@
 leak:_PyObject_Malloc
 leak:_PyObject_Realloc
+leak:_PyObject_GC
 leak:PyThread_allocate_lock
 leak:libpython*
 leak:imb_exitopenexr
@@ -13,4 +14,4 @@ leak:i965_dri
 leak:libdrm*
 leak:radeon*
 leak:libGLX*
-leak:libasan*
+# leak:libasan*