Bump sphinxext-rediraffe from 0.2.7 to 0.3.0 (#670)

Bumps [sphinxext-rediraffe](https://github.com/sphinx-doc/sphinxext-rediraffe) from 0.2.7 to 0.3.0.
- [Release notes](https://github.com/sphinx-doc/sphinxext-rediraffe/releases)
- [Commits](sphinx-doc/sphinxext-rediraffe@v0.2.7...v0.3.0)

---
updated-dependencies:
- dependency-name: sphinxext-rediraffe
  dependency-version: 0.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

environment.yml

@@ -9,7 +9,7 @@ dependencies:
     - jupyter-book==1.0.4post1
     - quantecon-book-theme==0.15.0
     - sphinx-tojupyter==0.3.1
-    - sphinxext-rediraffe==0.2.7
+    - sphinxext-rediraffe==0.3.0
     - sphinx-exercise==1.0.1
     - sphinx-proof==0.2.1
     - sphinxcontrib-youtube==1.4.1