Update flask-whooshee to be compatible with SQLAlchemy 1.4

requirements.txt

@@ -27,7 +27,7 @@ Flask-Mail==0.9.1
 flask-redis==0.4.0
 Flask-SQLAlchemy==2.5.1
 Flask-Themes2==0.1.5
-flask-whooshee==0.7.0
+flask-whooshee==0.8.1
 Flask-WTF==0.15.1
 flaskbb-plugin-conversations==1.0.7
 flaskbb-plugin-portal==1.1.3
@@ -45,7 +45,7 @@ Pillow==8.3.1
 pluggy==0.13.1
 prompt-toolkit==3.0.19
 Pygments==2.9.0
-python-dateutil==2.8.1
+python-dateutil==2.8.2
 python-editor==1.0.4
 pytz==2021.1
 redis==3.5.3