Update dependency openid-client to v6.8.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
openid-client	6.8.4 → 6.8.6

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Release Notes

panva/openid-client (openid-client)

v6.8.6

Compare Source

Fixes

• avoid undefined user-agent in fetchProtectedResource (492c3c3), references #​885

v6.8.5

Compare Source

Fixes

• types: expose custom fetch duplex option (a125bc8)
• types: use portable oauth4webapi declarations (2cab98f)

Documentation

• improve API index tables (c6e4ae3)
• update README.md and SECURITY.md to reflect passed EOL dates (d3721c2)

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