Bump sphinx-docsearch from 0.0.4 to 0.0.7

Bumps sphinx-docsearch from 0.0.4 to 0.0.7.

---
updated-dependencies:
- dependency-name: sphinx-docsearch
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -1,3 +1,3 @@
 sphinx-rtd-theme==2.0.0
 sphinxcontrib-googleanalytics==0.4
-sphinx-docsearch==0.0.4
+sphinx-docsearch==0.0.7