Bump pygments from 2.6.1 to 2.15.0 in /__tests__/data

Bumps [pygments](https://github.com/pygments/pygments) from 2.6.1 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](https://github.com/pygments/pygments/compare/2.6.1...2.15.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-type: direct:production
...

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

__tests__/data/requirements-linux.txt

@@ -6,7 +6,7 @@ Kivy==2.0.0rc3
 Kivy-Garden==0.1.4
 packaging==20.7
 pdf2image==1.12.1
-Pygments==2.6.1
+Pygments==2.15.0
 requests==2.24.0
 urllib3==1.25.10
 xlrd==1.2.0

__tests__/data/requirements.txt

@@ -32,7 +32,7 @@ pefile==2021.9.3; python_full_version >= '3.6.0'
 
 pillow==7.2
 
-pygments==2.6.1
+pygments==2.15.0
 
 pyinstaller==3.6