build(deps): bump third_party/abseil-cpp from c6b2735 to 3de434a (#…

…2464)

Bumps [third_party/abseil-cpp](https://github.com/abseil/abseil-cpp) from `c6b2735` to `3de434a`.
- [Release notes](https://github.com/abseil/abseil-cpp/releases)
- [Commits](abseil/abseil-cpp@c6b2735...3de434a)

---
updated-dependencies:
- dependency-name: third_party/abseil-cpp
  dependency-type: direct:production
...

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