Revert "change mininum TLS version for tag to digest resolution (#13886)"

[kahirokunn]

This reverts commit 171cecd.

Fixes #13937

Proposed Changes

• Supports TLS1.2 to support quay.io etc.

Release Note

Revert "change mininum TLS version for tag to digest resolution (#13886)"

[knative-prow]

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[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (ea2a6c8) 86.25% compared to head (b6fe119) 86.25%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13956   +/-   ##
=======================================
  Coverage   86.25%   86.25%           
=======================================
  Files         199      199           
  Lines       14749    14749           
=======================================
  Hits        12722    12722           
- Misses       1726     1727    +1     
+ Partials      301      300    -1     

Impacted Files	Coverage Δ
pkg/reconciler/revision/resolve.go	77.50% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[nak3]

/lgtm
/hold
/assign @dprotaso @izabelacg

Could you change the subject of this PR to make it more clear? I think it is okay to use the commit message Revert "change mininum TLS version for tag to digest resolution.

[kahirokunn]

@nak3 done. how about now?

[nak3]

Thank you! I am good to merge this. Let's wait for other reviewers in the Europe/US time.

[dprotaso]

I'm going to close htis PR since I'm making this property configurable via an env var in this PR - #13962

I also reverted the default back to 1.2.