Update dependency flask to v3

renovate[bot] · web-flow · commit fb8f5cdd425e · 2025-08-20T03:55:55.000Z
diff --git a/requirements.txt b/requirements.txt
@@ -1,6 +1,6 @@
 python-barcode==0.14.0
 pyqrcode==1.2.1
-flask==2.2.3
+flask==3.1.2
 environs==9.5.0
 pypng==0.20220715.0
 Pillow==9.4.0
