Bump asciidoctor from 2.0.25 to 2.0.26

Bumps [asciidoctor](https://github.com/asciidoctor/asciidoctor) from 2.0.25 to 2.0.26.
- [Release notes](https://github.com/asciidoctor/asciidoctor/releases)
- [Changelog](https://github.com/asciidoctor/asciidoctor/blob/main/CHANGELOG.adoc)
- [Commits](asciidoctor/asciidoctor@v2.0.25...v2.0.26)

---
updated-dependencies:
- dependency-name: asciidoctor
  dependency-version: 2.0.26
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -3,7 +3,7 @@ GEM
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    asciidoctor (2.0.25)
+    asciidoctor (2.0.26)
     asciidoctor-tabs (1.0.0.beta.6)
       asciidoctor (>= 2.0.0, < 3.0.0)
     base64 (0.2.0)