build: bump abseil-cpp to 20260526.0 for torch_tpu compatibility - #483
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torch_tpu main moved to abseil-cpp 20260526.0, whose BCR entry carries a different bzlmod compatibility level than older releases, so raiden's 20260107.1 pin fails module resolution when building the torch extension against a current torch_tpu checkout: ERROR: torch_tpu@_ depends on abseil-cpp@20260526.0 with compatibility level 0, but <root> depends on abseil-cpp@20260107.1 with compatibility level 1 which is different Bump the dep and force it with a single_version_override, which selects across the compatibility-level mismatch that a plain bazel_dep cannot (transitive deps such as protobuf still request level-1 releases).
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Fixes the module-resolution failure reported when building raiden's torch extension against a current torch_tpu checkout (e.g. in vLLM setups):
torch_tpu moved to abseil-cpp 20260526.0 as part of its XLA revision bump. That BCR entry has no
compatibility_level(defaults to 0) while older abseil releases are level 1, and bzlmod refuses to unify across levels — so the version bump alone is not enough; the addedsingle_version_overrideis what forces selection past the mismatch (transitive deps such as protobuf 33.5 still request level-1 releases).Validated in the ml-build container:
Note: after this lands, building against torch_tpu checkouts older than its abseil bump (e20c0244) fails with the mirror-image error — keep torch_tpu checkouts current.