deps(deps): bump langchain-anthropic in /requirements

Bumps [langchain-anthropic](https://github.com/langchain-ai/langchain) from 0.3.19 to 0.3.21.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-anthropic==0.3.19...langchain-anthropic==0.3.21)

---
updated-dependencies:
- dependency-name: langchain-anthropic
  dependency-version: 0.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -2,32 +2,36 @@
 #    uv pip compile requirements/requirements.in -o requirements/requirements.txt
 annotated-types==0.7.0
     # via pydantic
-anthropic==0.64.0
+anthropic==0.69.0
     # via langchain-anthropic
 anyio==4.10.0
     # via
     #   anthropic
     #   httpx
     #   openai
 arrow==1.3.0
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 certifi==2025.8.3
     # via
     #   httpcore
     #   httpx
     #   requests
 charset-normalizer==3.4.3
     # via requests
-click==8.2.1
-    # via -r requirements/requirements.in
+click==8.1.8
+    # via -r requirements.in
 distro==1.9.0
     # via
     #   anthropic
     #   openai
+docstring-parser==0.17.0
+    # via anthropic
+exceptiongroup==1.3.0
+    # via anyio
 gitdb==4.0.12
     # via gitpython
 gitpython==3.1.45
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 h11==0.16.0
     # via httpcore
 httpcore==1.0.9
@@ -38,7 +42,7 @@ httpx==0.28.1
     #   langsmith
     #   openai
 humanize==4.12.3
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 idna==3.10
     # via
     #   anyio
@@ -52,20 +56,20 @@ jsonpatch==1.33
     # via langchain-core
 jsonpointer==3.0.0
     # via jsonpatch
-langchain-anthropic==0.3.19
-    # via -r requirements/requirements.in
-langchain-core==0.3.74
+langchain-anthropic==0.3.21
+    # via -r requirements.in
+langchain-core==0.3.76
     # via
-    #   -r requirements/requirements.in
+    #   -r requirements.in
     #   langchain-anthropic
     #   langchain-openai
 langchain-openai==0.3.31
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 langsmith==0.4.16
     # via langchain-core
 loguru==0.7.3
-    # via -r requirements/requirements.in
-markdown-it-py==4.0.0
+    # via -r requirements.in
+markdown-it-py==3.0.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
@@ -78,7 +82,7 @@ packaging==25.0
     #   langchain-core
     #   langsmith
 prompt-toolkit==3.0.51
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 pydantic==2.11.7
     # via
     #   anthropic
@@ -91,12 +95,12 @@ pydantic-core==2.33.2
 pygments==2.19.2
     # via rich
 pyperclip==1.9.0
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 python-dateutil==2.9.0.post0
     # via arrow
 pyyaml==6.0.2
     # via
-    #   -r requirements/requirements.in
+    #   -r requirements.in
     #   langchain-core
 regex==2025.7.34
     # via tiktoken
@@ -108,7 +112,7 @@ requests==2.32.5
 requests-toolbelt==1.0.0
     # via langsmith
 rich==14.1.0
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 six==1.17.0
     # via python-dateutil
 smmap==5.0.2
@@ -122,7 +126,7 @@ tenacity==9.1.2
     # via langchain-core
 tiktoken==0.11.0
     # via
-    #   -r requirements/requirements.in
+    #   -r requirements.in
     #   langchain-openai
 tqdm==4.67.1
     # via openai
@@ -131,6 +135,9 @@ types-python-dateutil==2.9.0.20250822
 typing-extensions==4.14.1
     # via
     #   anthropic
+    #   anyio
+    #   exceptiongroup
+    #   gitpython
     #   langchain-core
     #   openai
     #   pydantic