Update deepdiff requirement from <6.3.2,>=5.7.0 to >=5.7.0,<6.6 in /requirements (#18623)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>

Author: dependabot[bot]

requirements/app/app.txt

@@ -1,7 +1,7 @@
 lightning-cloud >=0.5.38
 packaging
 typing-extensions >=4.0.0, <4.8.0
-deepdiff >=5.7.0, <6.3.2
+deepdiff >=5.7.0, <6.6.0
 starsessions >=1.2.1, <2.0 # strict
 fsspec >=2022.5.0, <2023.7.0
 croniter >=1.3.0, <1.5.0  # strict; TODO: for now until we find something more robust.