Remove sphinx version pin (#2134)

Summary:
Sphinx 7.2.0 caused issues in the past (see #1990), but things appear to work just fine on the latest sphinx version (7.2.6)

Pull Request resolved: #2134

Reviewed By: esantorella

Differential Revision: D51785066

Pulled By: Balandat

fbshipit-source-id: 794bae6ae374130118e7b07d72d73f8d831e4ede

setup.py

@@ -68,7 +68,7 @@ def read_deps_from_file(filname):
 # Read in pinned versions of the formatting tools
 FMT_REQUIRES += read_deps_from_file("requirements-fmt.txt")
 # Dev is test + formatting + docs generation
-DEV_REQUIRES = TEST_REQUIRES + FMT_REQUIRES + ["sphinx<=7.1.2"]
+DEV_REQUIRES = TEST_REQUIRES + FMT_REQUIRES + ["sphinx"]
 
 # read in README.md as the long description
 with open(os.path.join(root_dir, "README.md"), "r") as fh: