Update LICENSE-3rd-party.txt (#1840)

* Add regex license from https://raw.githubusercontent.com/mrabarnett/mrab-regex/refs/heads/hg/LICENSE.txt at b693a1f

## By Submitting this PR I confirm:
- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/NeMo-Agent-Toolkit/blob/develop/docs/source/resources/contributing/index.md).
- We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
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- When the PR is ready for review, new or existing tests cover these changes.
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## Summary by CodeRabbit

* **Chores**
  * Updated third-party license disclosures to include additional open-source library attributions.

Authors:
  - David Gardner (https://github.com/dagardner-nv)

Approvers:
  - Will Killian (https://github.com/willkill07)

URL: #1840

Author: dagardner-nv

LICENSE-3rd-party.txt

@@ -4945,6 +4945,216 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
 
+--- LICENSE FOR regex ---
+This work was derived from the 're' module of CPython 2.6 and CPython 3.1,
+copyright (c) 1998-2001 by Secret Labs AB and licensed under CNRI's Python 1.6
+license.
+
+All additions and alterations are licensed under the Apache 2.0 License.
+
+
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 --- LICENSE FOR rich ---
 Copyright (c) 2020 Will McGugan