fixed:nvd data mismatch results in critical error (#421)

Author: ananthan-123

cve_bin_tool/cvedb.py

@@ -108,9 +108,7 @@ def cache_update(cachedir, url, sha, chunk_size=16 * 1024, logger=LOGGER):
         gotsha = calculate.hexdigest().upper()
         if gotsha != sha:
             os.unlink(filepath)
-            logger.critical(
-                f"SHA mismatch for {filename} (have: {gotsha}, want: {sha})"
-            )
+            logger.warning(f"SHA mismatch for {filename} (have: {gotsha}, want: {sha})")
         else:
             logger.debug(f"Correct SHA for {filename}")
             return