bump explorer apis 1.28.5 RC1

[AmandaDErrico]

Please check if your PR fulfills the following requirements. This is simply a reminder of what we are going to look for before merging your PR. If you don't know all of this information when you create this PR, don't worry. You can edit this template as you're working on it.

• Tests for the changes have been added (for bug fixes / features)
• Necessary documentation (if appropriate) have been added / updated
• DCO signoffs have been added to all commits, including this PR

PR type

What type of changes does your PR introduce to Zowe? Put an x in the box that applies to this PR. If you're unsure about any of them, don't hesitate to ask.

• Bugfix
• Feature
• Other... Please describe:

Relevant issues

Fixes

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Does this PR introduce a breaking change?

• Yes
• No

Does this PR do something the person installing Zowe should know about?

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• Affected function: general area of interest *

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• Description: 1 line description *

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• Part: name of customizable file involved *

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multi-line description

Is there a related doc issue or Pull Request?

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Other information

[github-actions]

PAX build 3769 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/6304015187

[github-actions]

Test workflow 3278 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/1.28.5-PR-3584/zowe-1.28.5-pr-3584-3769-20230925194029.pax
Running on machine: zzow03
Result: FAILURE
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/6304085171

[github-actions]

PAX build 3770 SUCCEEDED.
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/6304528816

[github-actions]

Test workflow 3279 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/1.28.5-PR-3584/zowe-1.28.5-pr-3584-3770-20230925203454.pax
Running on machine: zzow03
Result: FAILURE
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/6304609262

[github-actions]

Test workflow 3279 is started.
Running install test: Convenience Pax
The zowe artifact being used by this test workflow: libs-snapshot-local/org/zowe/1.28.5-PR-3584/zowe-1.28.5-pr-3584-3770-20230925203454.pax
Running on machine: zzow03
Result: SUCCESS
Link to workflow run: https://github.com/zowe/zowe-install-packaging/actions/runs/6304609262

[ojcelis]

Rerun test and passed.