Issue #3412 - Update python dependencies

* flask-firehose contains the fix done by @marimeireles
* no tests broke after requests upgrade to 2.24.0
  now under the PSF roof
* no tests broke after ua-parser upgrade to 0.10.0
  this is another important part of our infrastructure.
  If we do not get the results we want after this upgrade
  is that we are missing tests.
* No breakage either for Werkzeug==1.0.1
  I was worried about
  Fix passing file-like objects like io.BytesIO to FileStorage.save
  but it seems fine.
* WTForms to 2.3.1
  note that version 3.0.0 is coming soon.

config/requirements.txt

@@ -1,13 +1,13 @@
 blinker==1.4
-Flask==1.1.1
-Flask-Firehose==0.2.2
-Flask-Limiter==1.1.0
-Flask-SQLAlchemy==2.4.1
+Flask==1.1.2
+Flask-Firehose==0.2.3
+Flask-Limiter==1.3.1
+Flask-SQLAlchemy==2.4.4
 Flask-WTF==0.14.3
 GitHub-Flask==3.2.0
 Pillow==7.2.0
-python-dotenv==0.11.0
-requests==2.22.0
-ua-parser==0.8
-Werkzeug==1.0.0
-WTForms==2.2.1
+python-dotenv==0.14.0
+requests==2.24.0
+ua-parser==0.10.0
+Werkzeug==1.0.1
+WTForms==2.3.1