Bump mhausenblas/mkdocs-deploy-gh-pages from 1.18 to 1.20

Bumps [mhausenblas/mkdocs-deploy-gh-pages](https://github.com/mhausenblas/mkdocs-deploy-gh-pages) from 1.18 to 1.20.
- [Release notes](https://github.com/mhausenblas/mkdocs-deploy-gh-pages/releases)
- [Commits](https://github.com/mhausenblas/mkdocs-deploy-gh-pages/compare/1.18...1.20)

...
updated-dependencies:
- dependency-name: mhausenblas/mkdocs-deploy-gh-pages
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Change-Id: Ic26061dbc6a7d7cf5049c6522876370035d22cd4
1 file changed
tree: b8377f2e0535d2a4d94bab7f91ec5f3d2ef432ff
  1. .github/
  2. .gitignore
  3. docs/
  4. mkdocs.yml
  5. requirements.txt