Bump apache-beam from 2.67.0 to 2.68.0

Bumps [apache-beam](https://github.com/apache/beam) from 2.67.0 to 2.68.0.
- [Release notes](https://github.com/apache/beam/releases)
- [Changelog](https://github.com/apache/beam/blob/master/CHANGES.md)
- [Commits](https://github.com/apache/beam/compare/v2.67.0...v2.68.0)

---
updated-dependencies:
- dependency-name: apache-beam
  dependency-version: 2.68.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/requirements.txt b/requirements.txt
index 12cdc28..a4bef6d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-apache-beam==2.67.0
+apache-beam==2.68.0