Bump langchain-classic in /samples/langgraph-sql-agent

Bumps [langchain-classic](https://github.com/langchain-ai/langchain) from 1.0.4 to 1.0.7.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-classic==1.0.4...langchain-classic==1.0.7)

---
updated-dependencies:
- dependency-name: langchain-classic
  dependency-version: 1.0.7
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

samples/langgraph-sql-agent/requirements.txt

@@ -650,9 +650,9 @@ jsonpointer==3.1.1 \
     --hash=sha256:0b801c7db33a904024f6004d526dcc53bbb8a4a0f4e32bfd10beadf60adf1900 \
     --hash=sha256:8ff8b95779d071ba472cf5bc913028df06031797532f08a7d5b602d8b2a488ca
     # via jsonpatch
-langchain-classic==1.0.4 \
-    --hash=sha256:03842b2f9681f0f56978d94c1dc155c9316ce1575db88584316dcd9087823ede \
-    --hash=sha256:b55d0925bc66cf2efa0b65d71c514c42cf9e4df798b9e976c063b3ecea8cf272
+langchain-classic==1.0.7 \
+    --hash=sha256:d9d9be38f7aa534ed0259c2410432e34a1f80b1d491e686749bb55af56479be3 \
+    --hash=sha256:debbec8065e69b95108d2652e8d5c44f4516e19aa8d716c02ed2211c3aee099d
     # via langchain-community
 langchain-community==0.4.1 \
     --hash=sha256:2135abb2c7748a35c84613108f7ebf30f8505b18c3c18305ffaecfc7651f6c6a \