Update executing requirement from ~=1.2.0 to ~=2.0.0

Updates the requirements on [executing](https://github.com/alexmojaki/executing) to permit the latest version.
- [Release notes](https://github.com/alexmojaki/executing/releases)
- [Commits](alexmojaki/executing@v1.2.0...v2.0.0)

---
updated-dependencies:
- dependency-name: executing
  dependency-type: direct:production
...

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

requirements.txt

@@ -36,7 +36,7 @@ docutils==0.18.1
 entrypoints==0.4
 exceptiongroup~=1.1.0
 execnet~=2.0.2
-executing~=1.2.0
+executing~=2.0.0
 fastjsonschema~=2.18.0
 fonttools~=4.42.0
 future==0.18.3