build(deps): bump pex from 2.8.0 to 2.9.0

Bumps [pex](https://github.com/pex-tool/pex) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/pex-tool/pex/releases)
- [Changelog](https://github.com/pex-tool/pex/blob/main/CHANGES.md)
- [Commits](pex-tool/pex@v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: pex
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -545,9 +545,9 @@ pendulum==3.0.0; python_version >= "3.12" \
     --hash=sha256:fa30af36bd8e50686846bdace37cf6707bdd044e5cb6e1109acbad3277232e04 \
     --hash=sha256:fd69b15374bef7e4b4440612915315cc42e8575fcda2a3d7586a0d88192d0c88 \
     --hash=sha256:fde4d0b2024b9785f66b7f30ed59281bd60d63d9213cda0eb0910ead777f6d37
-pex==2.8.0 \
-    --hash=sha256:1fd93a9016eba9349bfc79e8134a939cce26b1d2837aafed9a76f7304c58983a \
-    --hash=sha256:648520e52ecb312cef96e82843b13110d6929358ebea6490fc18b1f74eacb814
+pex==2.9.0 \
+    --hash=sha256:b3454a049c0a2e2633fd8108d07feac960d20bd3446d9b0d88e9c50c472199b2 \
+    --hash=sha256:de0c610837f247a7057abc1c572fa628886a72083466fb5049d56f095f556153
 prompt-toolkit==3.0.36 \
     --hash=sha256:3e163f254bef5a03b146397d7c1963bd3e2812f0964bb9a24e6ec761fd28db63 \
     --hash=sha256:aa64ad242a462c5ff0363a7b9cfe696c20d55d9fc60c11fd8e632d064804d305