Fixing errors related to Go 1.20

[scottmason88]

Description

This pull request will fix errors that came about with Go 1.20 deprecating rand.Seed.

Changes

• Changed loop in tablegenerator.go to use the variadic function
• Removed the random number generator seed from main.go, and added a package local variable doing this to service.go, since this is the only place the seed from main.go was used.

Reference

Issue #1775

Release Note

 Fix deprecated functions related to Go 1.20 

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: scottmason88 / name: Scott Mason (b2864b65e637326c40c5197cfda74a05f7cb36c8, 703355bd768f28ecb9c730d6d129357ce836c2a5, cf7c913e182ac3f96cdeffd909c19ff631afb917, 917d04f2e45bb0d62de74bbe80455aee0e72df03, 131375feb4e15c8e75e28682aad831d0d94a4d90)

[knative-prow[bot]]

Welcome @scottmason88! It looks like this is your first PR to knative/client 🎉

[knative-prow[bot]]

Hi @scottmason88. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov[bot]]

Codecov Report

Base: 79.88% // Head: 79.87% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (1d24121) compared to base (badd909). Patch coverage: 100.00% of modified lines in pull request are covered.

:exclamation: Current head 1d24121 differs from pull request most recent head 55125f9. Consider uploading reports for the commit 55125f9 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1779 +/- ## ========================================== - Coverage 79.88% 79.87% -0.01% ========================================== Files 174 174 Lines 13594 13593 -1 ========================================== - Hits 10859 10858 -1 Misses 1992 1992 Partials 743 743 ``` | [Impacted Files](https://codecov.io/gh/knative/client/pull/1779?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=knative) | Coverage Δ | | |---|---|---| | [cmd/kn/main.go](https://codecov.io/gh/knative/client/pull/1779?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=knative#diff-Y21kL2tuL21haW4uZ28=) | `87.82% <ø> (-0.21%)` | :arrow_down: | | [pkg/printers/tablegenerator.go](https://codecov.io/gh/knative/client/pull/1779?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=knative#diff-cGtnL3ByaW50ZXJzL3RhYmxlZ2VuZXJhdG9yLmdv) | `100.00% <100.00%> (ø)` | | | [pkg/serving/service.go](https://codecov.io/gh/knative/client/pull/1779?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=knative#diff-cGtnL3NlcnZpbmcvc2VydmljZS5nbw==) | `90.32% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=knative). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=knative)

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[dsimansk]

/ok-to-test

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rhuss, scottmason88

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