Backport: fix(anthropic): forward thinking { type: 'disabled' } to the API

[github-actions]

This is an automated backport of #16687 to the release-v6.0 branch. FYI @gr2m
This backport has conflicts that need to be resolved manually.

git cherry-pick output

Auto-merging packages/anthropic/src/anthropic-messages-language-model.test.ts
CONFLICT (content): Merge conflict in packages/anthropic/src/anthropic-messages-language-model.test.ts
Auto-merging packages/anthropic/src/anthropic-messages-language-model.ts
error: could not apply 0aa0ff389f... fix(anthropic): forward thinking { type: 'disabled' } to the API (#16687)
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config set advice.mergeConflict false"

[github-actions]

🚀 Published in:

Package	Version
@ai-sdk/amazon-bedrock	4.0.129 github npm
@ai-sdk/anthropic	3.0.93 github npm
@ai-sdk/anthropic-aws	1.0.15 github npm
@ai-sdk/google-vertex	4.0.156 github npm