Content block token support in callbacks added

Changes since langchain-mistralai==1.1.4

release(mistralai): 1.1.5 (#38038) fix(core): support content block tokens in callbacks (#34739) hotfix(openai): min core dep (#37990) chore(model-profiles): refresh model profile data (#37916) test(langchain,partners): disable pytest-benchmark under xdist to silence PytestBenchmarkWarning (#37901) chore(model-profiles): refresh model profile data (#37870) chore(infra): bump langchain-tests floor to 1.1.9 (#37610) test(mistralai): stabilize integration tests with rate limiting and retries (#37588) chore: bump idna from 3.10 to 3.15 in /libs/partners/mistralai (#37555) chore: bump langsmith from 0.8.4 to 0.8.5 in /libs/partners/mistralai (#37554) ci(infra): harden Dependabot version-bound preservation (#37510) chore: bump langsmith from 0.8.0 to 0.8.4 in /libs/partners/mistralai (#37418) chore: bump langsmith from 0.7.31 to 0.8.0 in /libs/partners/mistralai (#37401) chore: bump urllib3 from 2.6.3 to 2.7.0 in /libs/partners/mistralai (#37338) chore: bump langchain-core from 1.3.2 to 1.3.3 in /libs/partners/mistralai (#37272)