chore(deps): bump langchain-core from 1.2.23 to 1.2.26 in /application

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 1.2.23 to 1.2.26.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/compare/langchain-core==1.2.23...langchain-core==1.2.26)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 1.2.26
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

application/requirements.txt

@@ -33,7 +33,7 @@ jsonpointer==3.1.1
 kombu==5.6.2
 langchain==1.2.3
 langchain-community==0.4.1
-langchain-core==1.2.23
+langchain-core==1.2.29
 langchain-openai==1.1.12
 langchain-text-splitters==1.1.1
 langsmith==0.7.31