ci: run cancel workflow on pull requests

[snitin315]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

No.

Motivation / Use-Case

Run cancel workflow on pull requests from external contributors.

Breaking Changes

No.

Additional Info

No.

[codecov]

Codecov Report

Base: 92.06% // Head: 92.06% // No change to project coverage 👍

Coverage data is based on head (76d23f1) compared to base (e695c22).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4580   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files          16       16           
  Lines        1639     1639           
  Branches      617      617           
=======================================
  Hits         1509     1509           
  Misses        119      119           
  Partials       11       11           

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