Bump flask from 2.0.1 to 2.2.5 in /src/service

Bumps [flask](https://github.com/pallets/flask) from 2.0.1 to 2.2.5.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.0.1...2.2.5)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

src/service/requirements.txt

@@ -2,7 +2,7 @@ certifi==2021.5.30
 charset-normalizer==2.0.7
 click==8.0.1
 elasticsearch==7.14.1
-Flask==2.0.1
+Flask==2.2.5
 Flask-Cors==4.0.2
 idna==3.7
 itsdangerous==2.0.1