chore: Move bwagner5 to emeritus maintainer

[jonathan-innis]

Fixes #N/A

Description

Moving @bwagner5 to emeritus since he's become less directly involved in maintaining the project

Brandon shows as < 10 contributions in the last year: https://k8s.devstats.cncf.io/d/13/developer-activity-counts-by-repository-group?orgId=1&var-period_name=Last%20year&var-metric=contributions&var-repogroup_name=All&var-repo_name=kubernetes-sigs%2Fkarpenter&var-country_name=All

How was this change tested?

make presubmit

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[coveralls]

Pull Request Test Coverage Report for Build 13725414702

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 7 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.009%) to 81.574%

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Files with Coverage Reduction	New Missed Lines	%
pkg/controllers/provisioning/scheduling/preferences.go	7	86.52%

Totals
Change from base Build 13716264738:	0.009%
Covered Lines:	9589
Relevant Lines:	11755

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💛 - Coveralls