fix: requirements.txt to reduce vulnerabilities (#281)

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-PILLOW-6514866

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

requirements.txt

@@ -13,7 +13,7 @@ HiYaPyCo==0.5.1
 mistune>=2.0.3 # not directly required, pinned by Snyk to avoid a vulnerability
 numpy>=1.22.2 # not directly required, pinned by Snyk to avoid a vulnerability
 setuptools>=65.5.1 # not directly required, pinned by Snyk to avoid a vulnerability
-pillow>=10.2.0 # not directly required, pinned by Snyk to avoid a vulnerability
+pillow>=10.3.0 # not directly required, pinned by Snyk to avoid a vulnerability
 Werkzeug>=3.0.1
 fonttools>=4.43.0 # not directly required, pinned by Snyk to avoid a vulnerability
 dash>=2.15.0 # not directly required, pinned by Snyk to avoid a vulnerability