deps(deps): bump tiktoken from 0.11.0 to 0.12.0 in /requirements

Bumps [tiktoken](https://github.com/openai/tiktoken) from 0.11.0 to 0.12.0.
- [Release notes](https://github.com/openai/tiktoken/releases)
- [Changelog](https://github.com/openai/tiktoken/blob/main/CHANGELOG.md)
- [Commits](openai/tiktoken@0.11.0...0.12.0)

---
updated-dependencies:
- dependency-name: tiktoken
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -10,7 +10,7 @@ anyio==4.10.0
     #   httpx
     #   openai
 arrow==1.3.0
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 certifi==2025.8.3
     # via
     #   httpcore
@@ -19,15 +19,15 @@ certifi==2025.8.3
 charset-normalizer==3.4.3
     # via requests
 click==8.2.1
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 distro==1.9.0
     # via
     #   anthropic
     #   openai
 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 +38,7 @@ httpx==0.28.1
     #   langsmith
     #   openai
 humanize==4.12.3
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 idna==3.10
     # via
     #   anyio
@@ -53,18 +53,18 @@ jsonpatch==1.33
 jsonpointer==3.0.0
     # via jsonpatch
 langchain-anthropic==0.3.19
-    # via -r requirements/requirements.in
+    # via -r requirements.in
 langchain-core==0.3.74
     # 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
+    # via -r requirements.in
 markdown-it-py==4.0.0
     # via rich
 mdurl==0.1.2
@@ -78,7 +78,7 @@ 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 +91,12 @@ 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 +108,7 @@ 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
@@ -120,9 +120,9 @@ sniffio==1.3.1
     #   openai
 tenacity==9.1.2
     # via langchain-core
-tiktoken==0.11.0
+tiktoken==0.12.0
     # via
-    #   -r requirements/requirements.in
+    #   -r requirements.in
     #   langchain-openai
 tqdm==4.67.1
     # via openai