Change minimum TLS version to 1.3 - tag to digest resolution

[izabelacg]

Proposed Changes

• Change minimum TLS version (from 1.2 to 1.3) for tag to digest resolution

TLS 1.3 comes with numerous enhancements, such as a quicker TLS handshake and more secure cipher suites.

Release Note

* Controller uses TLS 1.3 as the minimum version when communicating with image registries for tag to digest resolution

[codecov]

Codecov Report

Patch coverage: 66.66% and no project coverage change.

Comparison is base (ef58d9b) 86.23% compared to head (e8e7187) 86.23%.

❗ Current head e8e7187 differs from pull request most recent head b35e117. Consider uploading reports for the commit b35e117 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13886   +/-   ##
=======================================
  Coverage   86.23%   86.23%           
=======================================
  Files         199      199           
  Lines       14706    14706           
=======================================
  Hits        12682    12682           
- Misses       1724     1725    +1     
+ Partials      300      299    -1     

Impacted Files	Coverage Δ
cmd/activator/main.go	0.00% <0.00%> (ø)
pkg/activator/certificate/cache.go	41.81% <100.00%> (ø)
pkg/reconciler/revision/resolve.go	77.50% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, izabelacg

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