Update requirements.txt (#565)

Co-authored-by: Geir Arne Hjelle <geirarne@gmail.com>

Author: acsany

primer-on-jinja-templating/requirements.txt

@@ -1,6 +1,7 @@
-click==8.1.3
-Flask==2.1.2
-itsdangerous==2.1.2
-Jinja2==3.1.2
-MarkupSafe==2.1.1
-Werkzeug==2.1.2
+blinker==1.8.2
+click==8.1.7
+Flask==3.0.3
+itsdangerous==2.2.0
+Jinja2==3.1.4
+MarkupSafe==2.1.5
+Werkzeug==3.0.3