Fixes for flask version 2.1

Fixes for compatibility with sqlalchemy 2.0

cps/debug_info.py

@@ -29,7 +29,7 @@ except ImportError:
 
 import os
 
-from flask import send_file
+from flask import send_file, __version__
 
 from . import logger, config
 from .about import collect_stats
@@ -43,9 +43,15 @@ def assemble_logfiles(file_name):
         with open(f, 'r') as fd:
             shutil.copyfileobj(fd, wfd)
     wfd.seek(0)
-    return send_file(wfd,
-                     as_attachment=True,
-                     attachment_filename=os.path.basename(file_name))
+    if int(__version__.split('.')[0]) < 2:
+        return send_file(wfd,
+                         as_attachment=True,
+                         attachment_filename=os.path.basename(file_name))
+    else:
+        return send_file(wfd,
+                         as_attachment=True,
+                         download_name=os.path.basename(file_name))
+
 
 def send_debug():
     file_list = glob.glob(logger.get_logfile(config.config_logfile) + '*')
@@ -60,6 +66,11 @@ def send_debug():
         for fp in file_list:
             zf.write(fp, os.path.basename(fp))
     memory_zip.seek(0)
-    return send_file(memory_zip,
-                     as_attachment=True,
-                     attachment_filename="Calibre-Web-debug-pack.zip")
+    if int(__version__.split('.')[0]) < 2:
+        return send_file(memory_zip,
+                         as_attachment=True,
+                         attachment_filename="Calibre-Web-debug-pack.zip")
+    else:
+        return send_file(memory_zip,
+                         as_attachment=True,
+                         download_name="Calibre-Web-debug-pack.zip")