Rollback the changes in requirements.txt file

Issue-Id: NONRTRIC-892
Change-Id: I4e06eed46a89717cde44e5856c54e620f5d0cea4
Signed-off-by: rohithrajneesh <rohith.rajneesh@est.tech>
diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index 997c486..59e8e0a 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -12,4 +12,3 @@
 setuptools
 doc8
 docutils < 0.17
-flask==3.0.0
\ No newline at end of file