feat(langchain): Support v1 (#4874)

### Description
Adapt to import changes in new langchain 1.x

#### Issues
Closes #4735

#### Reminders
- Please add tests to validate your changes, and lint your code using
`tox -e linters`.
- Add GH Issue ID _&_ Linear ID (if applicable)
- PR title should use [conventional
commit](https://develop.sentry.dev/engineering-practices/commit-messages/#type)
style (`feat:`, `fix:`, `ref:`, `meta:`)
- For external contributors:
[CONTRIBUTING.md](https://github.com/getsentry/sentry-python/blob/master/CONTRIBUTING.md),
[Sentry SDK development docs](https://develop.sentry.dev/sdk/), [Discord
community](https://discord.gg/Ww9hbqr)

Author: sentrivana

scripts/populate_tox/config.py

@@ -202,8 +202,8 @@
             "*": ["openai", "tiktoken", "langchain-openai"],
             "<=0.1": ["httpx<0.28.0"],
             ">=0.3": ["langchain-community"],
+            ">=1.0": ["langchain-classic"],
         },
-        "include": "<1.0",
         "python": {
             "<1.0": "<3.14",  # https://github.com/langchain-ai/langchain/issues/33449#issuecomment-3408876631
         },
@@ -215,8 +215,8 @@
             "*": ["openai", "langchain-openai"],
             "<=0.1": ["httpx<0.28.0"],
             ">=0.3": ["langchain-community"],
+            ">=1.0": ["langchain-classic"],
         },
-        "include": "<1.0",
         "python": {
             "<1.0": "<3.14",  # https://github.com/langchain-ai/langchain/issues/33449#issuecomment-3408876631
         },