chore(deps): update quay.io/oauth2-proxy/oauth2-proxy docker tag to v7.8.1

This MR contains the following updates:

Package	Type	Update	Change
quay.io/oauth2-proxy/oauth2-proxy (source)	Kustomization	minor	v7.7.1 -> v7.8.1
quay.io/oauth2-proxy/oauth2-proxy (source)		minor	v7.7.1 -> v7.8.1

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Release Notes

oauth2-proxy/oauth2-proxy (quay.io/oauth2-proxy/oauth2-proxy)

v7.8.1

Compare Source

v7.8.0

Compare Source

• #​2887 fix: jwt regex validation error during skip-jwt-bearer-tokens flow
• #​2920 fix: missing oauth2-proxy version for docker builds

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