Shorten the CI badge label

[kevgo]

The label for the CI badge currently reads "CI Tasks for Ory Kratos", resulting in this long badge:

This PR shortens the badge label to "CI".

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I am following the contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability. If this pull request addresses a security.
  vulnerability, I confirm that I got green light (please contact [email protected]) from the
  maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added or changed the documentation.

[codecov]

Codecov Report

Merging #2514 (1106300) into master (7136e94) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2514      +/-   ##
==========================================
+ Coverage   76.57%   76.59%   +0.02%     
==========================================
  Files         317      317              
  Lines       17636    17636              
==========================================
+ Hits        13504    13508       +4     
+ Misses       3193     3190       -3     
+ Partials      939      938       -1     

Impacted Files	Coverage Δ
session/test/persistence.go	100.00% <0.00%> (+1.38%)	⬆️

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