Upgrade versions of vendored libs

vendor/github.com/DataDog/zstd/debug.c

@@ -22,6 +22,12 @@
 
 #include "debug.h"
 
+#if !defined(ZSTD_LINUX_KERNEL) || (DEBUGLEVEL>=2)
+/* We only use this when DEBUGLEVEL>=2, but we get -Werror=pedantic errors if a
+ * translation unit is empty. So remove this from Linux kernel builds, but
+ * otherwise just leave it in.
+ */
 int g_debuglevel = DEBUGLEVEL;
+#endif
 
 #endif /* USE_EXTERNAL_ZSTD */