Bump setuptools from 50.3.0 to 78.1.1 in /requirements

Bumps [setuptools](https://github.com/pypa/setuptools) from 50.3.0 to 78.1.1.
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/NEWS.rst)
- [Commits](pypa/setuptools@v50.3.0...v78.1.1)

---
updated-dependencies:
- dependency-name: setuptools
  dependency-version: 78.1.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/core.txt

@@ -49,7 +49,7 @@ rsa==4.6
 Rx==1.6.1
 s3transfer==0.4.2
 serverless_wsgi==1.7.5
-setuptools==50.3.0
+setuptools==78.1.1
 six==1.15.0
 sniffio==1.1.0
 sortedcontainers==2.2.2