Bump splunk-appinspect from 2.26.0 to 2.28.0

Bumps [splunk-appinspect](https://splunk.com) from 2.26.0 to 2.28.0.

---
updated-dependencies:
- dependency-name: splunk-appinspect
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -12,7 +12,7 @@ PyYAML==5.4.1
 questionary==1.10.0
 requests==2.28.1
 six==1.16.0
-splunk-appinspect==2.26.0
+splunk-appinspect==2.28.0
 splunk-sdk==1.7.2
 wrapt-timeout-decorator==1.3.12.2
 xmltodict==0.13.0