Update dependency abseil-cpp to v20250814.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
abseil-cpp	bazel_dep	minor	20250814.1 → 20250814.2

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Release Notes

abseil/abseil-cpp (abseil-cpp)

v20250814.2: Abseil LTS branch, August 2025, Patch 2

Compare Source

Abseil LTS 2025081.2

What's New:

• absl::Mutex now contains lower-case method names like lock() and shared_lock() to align with standard C++ mutex methods. This allows absl::Mutex to be used with std::scoped_lock and friends. The old names are still present but may be removed in a future release.
• The RAII Mutex-locker types like absl::MutexLock, absl::ReaderMutexLock, and friends now accept references to absl::Mutex. The pointer-accepting constructors are now deprecated, and may be removed in a future release.

Breaking Changes:

• Nullability template types, which were deprecated in the May 2025 release, have been removed.
• absl::string_view(nullptr), which is undefined behavior according to the C++ standard, now triggers an assert failure. Note that unless you changed absl/base/options.h, absl::string_view is an alias for std::string_view, so by default you will be inheriting the behavior of your standard library instead of using the Abseil implementation.
• Abseil's hash tables now require a hash function that has a return type with size >= sizeof(size_t).

Baseline: 987c57f
Cherry-pick: d38452e (Patch 1)
Cherry-pick: 7313246 (Patch 2)

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