Update league/oauth2-client requirement from 2.4.* to 2.6.*

[dependabot]

Updates the requirements on league/oauth2-client to permit the latest version.

Release notes

Sourced from league/oauth2-client's releases.

2.6.0

• Indicate support for PHP 8
• Allow time to be set for testing purposes #852

Changelog

Sourced from league/oauth2-client's changelog.

2.6.0

Released: 2020-10-27

• Indicate support for PHP 8
• Allow time to be set for testing purposes #852

2.5.0

Released: 2020-07-18

• Allow Guzzle 7.x to be used #847

2.4.1

Released: 2018-11-22

• Revert to use of AccessToken in type hints to preserve backwards compatibility; this fixes the issue reported in #752 and #753

2.4.0

Released: 2018-11-21

• Add HttpBasicAuthOptionProvider to ease implementation for providers requiring HTTP basic auth
• Add GuardedPropertyTrait to allow providers the ability to specify properties that may not be overridden by user-defined values passed to the provider constructor
• Add AccessTokenInterface and ResourceOwnerAccessTokenInterface to allow providers the ability to override the default AccessToken

2.3.1

Released: 2018-11-19

• Allow paragonie/random_compat's empty 9.99.99 placeholder
• Throw an UnexpectedValueException on non-JSON responses from access token request (when calling AbstractProvider::getAccessToken())

2.3.0

Released: 2018-01-13

• Add ProviderRedirectTrait tool for 3rd-party provider libraries to use when handling provider redirections
• Fix TypeError thrown because getResourceOwner() receives a non-JSON Response
• Gracefully handle non-standard errors received from providers

... (truncated)

Commits

• badb01e Prepare changelog for release
• 25f00da add detail on unit of time for access token epxiration (#824)
• 58ebed7 Ignore more files from package export
• 1de7a9d Add configuration for Codecov
• d01d07b Use Codecov for coverage reporting
• 2392bf7 Allow time to be set for test purposes (#852)
• 937c0ac Include compwright/oauth2-housecallpro in provider list (#854)
• bc5cbf2 Added GotoWebinar provider (#853)
• c289f76 Add Gumroad Third-Party Provider to list (#845)
• 1dee734 Added Zoho Provider To Table (#838)
• Additional commits viewable in compare view

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