Skip unreliable tests regardless of chosen crypto backend

rust-sequoia-openpgp.spec

@@ -224,11 +224,11 @@ use the "openssl-sys" feature of the "%{crate}" crate.
 
 %if %{with check}
 %check
+# * skip tests that are not reliable:
+#   https://gitlab.com/sequoia-pgp/sequoia/-/issues/1064
 # * run tests with the Nettle crypto backend (default)
-%cargo_test -n -f crypto-nettle,compression
+%cargo_test -n -f crypto-nettle,compression -- -- --skip leak_tests
 # * run tests with the OpenSSL crypto backend
-# * skip tests that are not reliable with OpenSSL:
-#   https://gitlab.com/sequoia-pgp/sequoia/-/issues/1064
 %cargo_test -n -f crypto-openssl,compression -- -- --skip leak_tests
 %endif