Bump pygments from 2.14.0 to 2.15.0 in /.github/workflows

Bumps [pygments](https://github.com/pygments/pygments) from 2.14.0 to 2.15.0.
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.14.0...2.15.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/mkdocs_requirements.txt

@@ -16,10 +16,6 @@ ghp-import==2.1.0
     # via mkdocs
 idna==3.4
     # via requests
-importlib-metadata==6.0.0
-    # via
-    #   markdown
-    #   mkdocs
 jinja2==3.1.2
     # via
     #   mkdocs
@@ -36,22 +32,22 @@ mergedeep==1.3.4
     # via mkdocs
 mkdocs==1.4.2
     # via
-    #   -r .github/workflows/mkdocs_requirements.in
+    #   -r mkdocs_requirements.in
     #   mkdocs-macros-plugin
     #   mkdocs-material
 mkdocs-macros-plugin==0.7.0
-    # via -r .github/workflows/mkdocs_requirements.in
+    # via -r mkdocs_requirements.in
 mkdocs-material==9.0.6
-    # via -r .github/workflows/mkdocs_requirements.in
+    # via -r mkdocs_requirements.in
 mkdocs-material-extensions==1.1.1
     # via mkdocs-material
 packaging==23.0
     # via mkdocs
-pygments==2.14.0
+pygments==2.15.0
     # via mkdocs-material
 pymdown-extensions==10.0
     # via
-    #   -r .github/workflows/mkdocs_requirements.in
+    #   -r mkdocs_requirements.in
     #   mkdocs-material
 python-dateutil==2.8.2
     # via
@@ -69,7 +65,7 @@ regex==2022.10.31
     # via mkdocs-material
 requests==2.31.0
     # via
-    #   -r .github/workflows/mkdocs_requirements.in
+    #   -r mkdocs_requirements.in
     #   mkdocs-material
 six==1.16.0
     # via python-dateutil
@@ -79,5 +75,3 @@ urllib3==1.26.14
     # via requests
 watchdog==2.2.1
     # via mkdocs
-zipp==3.11.0
-    # via importlib-metadata