Update dependency openid-client to v6.8.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
openid-client	6.8.4 → 6.8.8

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Release Notes

panva/openid-client (openid-client)

v6.8.8

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Fixes

• apply the default HTTP request timeout (af32783)
• calculate token lifetimes using elapsed time (e816bf0)
• isolate lazy client authentication handler caches (d687796)
• passport: handle rejected async verification callbacks (d730f80)
• preserve clock settings across DCR nonce retries (5433d68)
• release: separate changelog sections (57fcbc6)
• retain polling abort signals through response processing (b26170e)
• select a unique decryption key when kid is omitted (10ba026)

Refactor

• share grant polling lifecycle and retry handling (b931c40)

v6.8.7

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Fixes

• allow destructuring the claims helper (38bd8c0), references #​887

v6.8.6

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Fixes

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

v6.8.5

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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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