chore(repo): replace git.io in the issue template

[SukkaW]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

rollup/plugins#1171

Description

All links on git.io will stop redirecting after April 29, 2022: https://github.blog/changelog/2022-04-25-git-io-deprecation/

Replace the git.io link with its actual URL.

[codecov]

Codecov Report

Merging #4479 (e6b06da) into master (8b5f329) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4479   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files         205      205           
  Lines        7327     7327           
  Branches     2080     2080           
=======================================
  Hits         7236     7236           
  Misses         33       33           
  Partials       58       58           

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