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:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       uri (>= 0.13.1)
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    asciidoctor (2.0.25)
+    asciidoctor (2.0.26)
     ast (2.4.3)
     base64 (0.3.0)
     benchmark-ips (2.14.0)