Update Go version to 1.19.8

[asf-ci-trafficcontrol]

What does this PR (Pull Request) do?

This PR makes the Go components of Traffic Control build using Go version 1.19.8 and updates the golang.org/x/ dependencies.

See the Go 1.19.8 release notes:

go1.19.8 (released 2023-04-04) includes security fixes to the go/parser, html/template, mime/multipart, net/http, and net/textproto packages, as well as bug fixes to the linker, the runtime, and the time package. See the Go 1.19.8 milestone on our issue tracker for details.

Which Traffic Control components are affected by this PR?

• Traffic Control Cache Config (t3c, formerly ORT)
• Traffic Control Health Client (tc-health-client)
• Traffic Control Client
• Traffic Monitor
• Traffic Ops
• Traffic Stats
• Grove
• CDN in a Box - Enroller
• CI tests for Go components
• Build system - Go version in builder images

What is the best way to verify this PR?

Run unit tests and API tests. Since this is only a patch-level version update, the only changes were bugfixes. Breaking changes would be unexpected.

The following criteria are ALL met by this PR

• Existing tests are sufficient, no additional tests necessary
• The documentation only mentions the major Go version, no documentation updates necessary.
• The changelog already mentions updating to Go 1.19, no additional changelog message necessary.
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Merging #7428 (da32e2f) into master (0e2b42f) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7428      +/-   ##
============================================
- Coverage     27.12%   27.12%   -0.01%     
  Complexity       98       98              
============================================
  Files           685      685              
  Lines         77414    77414              
  Branches         90       90              
============================================
- Hits          20999    20998       -1     
- Misses        54423    54424       +1     
  Partials       1992     1992              

Flag	Coverage Δ
golib_unit	48.40% <ø> (-0.01%)	⬇️
grove_unit	4.60% <ø> (ø)
t3c_unit	5.32% <ø> (ø)
traffic_monitor_unit	21.28% <ø> (ø)
traffic_ops_integration	69.42% <ø> (ø)
traffic_ops_unit	22.19% <ø> (ø)
traffic_stats_unit	10.14% <ø> (ø)
unit_tests	23.69% <ø> (-0.01%)	⬇️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.63% <ø> (ø)

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see 1 file with indirect coverage changes

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