Bump pygments from 2.11.2 to 2.15.0

Bumps [pygments](https://github.com/pygments/pygments) from 2.11.2 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.11.2...2.15.0)

---
updated-dependencies:
- dependency-name: pygments
  dependency-type: indirect
...

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

dev-requirements.txt

@@ -66,8 +66,6 @@ idna==2.10
     #   requests
 imagesize==1.3.0
     # via sphinx
-importlib-metadata==4.10.1
-    # via sphinx
 jinja2==2.11.3
     # via
     #   -c requirements.txt
@@ -90,7 +88,7 @@ pycodestyle==2.8.0
     # via flake8
 pyflakes==2.4.0
     # via flake8
-pygments==2.11.2
+pygments==2.15.0
     # via sphinx
 pygraphviz==1.9
     # via -r dev-requirements.in
@@ -155,8 +153,6 @@ urllib3==1.26.3
     #   requests
 wheel==0.37.1
     # via pip-tools
-zipp==3.7.0
-    # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
 # pip