chore(CI): upgrade mac os version to macos-13 (#51)

Author: rishav-karanjit

.github/workflows/ci_tests.yaml

@@ -22,7 +22,7 @@ jobs:
           # x86 builds are only meaningful for Windows
           - os: windows-latest
             architecture: x86
-          - os: macos-12
+          - os: macos-13
             architecture: x64
         major:
           - 3

doc/requirements.txt

@@ -1,2 +1,2 @@
-sphinx>=1.3.0
+sphinx>=1.3.0,<7.4.7
 sphinx_rtd_theme