depend(deps): update tkinter-async-execute requirement (#585)

Updates the requirements on tkinter-async-execute to permit the latest version.

---
updated-dependencies:
- dependency-name: tkinter-async-execute
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/mandatory.txt

@@ -2,7 +2,7 @@ aiohttp>=3.9.0,<3.10.0
 aiohttp_socks>=0.8,<0.10
 typeguard>=2.13,<2.14
 typing_extensions>=4,<5; python_version < "3.11"
-tkinter-async-execute>=1.2,<1.3
+tkinter-async-execute>=1.2,<1.4
 asyncio-event-hub>=1.0,<1.2
 tkclasswiz>=1.4,<1.5
 ttkbootstrap==1.10.1