Bump pybtex from 0.24.0 to 0.25.1

Bumps [pybtex](https://bitbucket.org/pybtex-devs/pybtex) from 0.24.0 to 0.25.1.
- [Changelog](https://bitbucket.org/pybtex-devs/pybtex/src/master/CHANGES)
- [Commits](https://bitbucket.org/pybtex-devs/pybtex/commits)

---
updated-dependencies:
- dependency-name: pybtex
  dependency-version: 0.25.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -7,4 +7,4 @@ networkx==3.4.2
 matminer==0.9.3
 monty==2025.3.3
 pubchempy==1.0.4
-pybtex==0.24.0
+pybtex==0.25.1