chore(deps): update dependency social-auth-core to v4.8.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
social-auth-core (changelog)	==4.8.6 → ==4.8.7

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Release Notes

python-social-auth/social-core (social-auth-core)

v4.8.7

Compare Source

Added

• OpenID Connect backends can now opt in to PKCE support

Changed

• PKCE defaults now match RFC 7636 requirements

Security

• Tightened redirect URL validation
• Tightened OAuth state handling for Clever, Eventbrite, GoClio, MailChimp, SurveyMonkey and Untappd backends
• SAML authentication now restores saved sessions only after response validation

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