chore(deps): update quay.io/keycloak/keycloak docker tag to v26

[renovate]

This PR contains the following updates:

Package	Update	Change
quay.io/keycloak/keycloak	major	25.0.6 → 26.5.6

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[tessig]

need to check manually if the example still works with the major upgrade

[github-actions]

Package	Line Rate	Health
flamingo.me/flamingo/v3	44%	❌
flamingo.me/flamingo/v3/core/auth	13%	❌
flamingo.me/flamingo/v3/core/auth/example/custom	0%	❌
flamingo.me/flamingo/v3/core/auth/example	0%	❌
flamingo.me/flamingo/v3/core/auth/fake	50%	➖
flamingo.me/flamingo/v3/core/auth/http	40%	❌
flamingo.me/flamingo/v3/core/auth/mock	0%	❌
flamingo.me/flamingo/v3/core/auth/oauth	49%	❌
flamingo.me/flamingo/v3/core/cache	66%	➖
flamingo.me/flamingo/v3/core/gotemplate	87%	✔
flamingo.me/flamingo/v3/core/healthcheck/domain/healthcheck	0%	❌
flamingo.me/flamingo/v3/core/healthcheck/interfaces/controllers	67%	➖
flamingo.me/flamingo/v3/core/healthcheck	66%	➖
flamingo.me/flamingo/v3/core/internalauth/application	88%	✔
flamingo.me/flamingo/v3/core/internalauth	100%	✔
flamingo.me/flamingo/v3/core/locale/application	87%	✔
flamingo.me/flamingo/v3/core/locale/domain	75%	✔
flamingo.me/flamingo/v3/core/locale/infrastructure/fake	0%	❌
flamingo.me/flamingo/v3/core/locale/infrastructure	0%	❌
flamingo.me/flamingo/v3/core/locale/interfaces/controllers	100%	✔
flamingo.me/flamingo/v3/core/locale/interfaces/templatefunctions	92%	✔
flamingo.me/flamingo/v3/core/locale	59%	➖
flamingo.me/flamingo/v3/core/oauth/application	4%	❌
flamingo.me/flamingo/v3/core/oauth/application/fake	0%	❌
flamingo.me/flamingo/v3/core/oauth/domain	62%	➖
flamingo.me/flamingo/v3/core/oauth/example	0%	❌
flamingo.me/flamingo/v3/core/oauth/infrastructure	0%	❌
flamingo.me/flamingo/v3/core/oauth/interfaces	0%	❌
flamingo.me/flamingo/v3/core/oauth/interfaces/fake	0%	❌
flamingo.me/flamingo/v3/core/oauth	55%	➖
flamingo.me/flamingo/v3/core/requestlogger	100%	✔
flamingo.me/flamingo/v3/core/requesttask	10%	❌
flamingo.me/flamingo/v3/core/robotstxt/interfaces	0%	❌
flamingo.me/flamingo/v3/core/robotstxt	50%	➖
flamingo.me/flamingo/v3/core/runtime	77%	✔
flamingo.me/flamingo/v3/core/security/application/role	96%	✔
flamingo.me/flamingo/v3/core/security/application	98%	✔
flamingo.me/flamingo/v3/core/security/application/voter	100%	✔
flamingo.me/flamingo/v3/core/security/domain	0%	❌
flamingo.me/flamingo/v3/core/security/interface/controller	100%	✔
flamingo.me/flamingo/v3/core/security/interface/middleware	72%	➖
flamingo.me/flamingo/v3/core/security	59%	➖
flamingo.me/flamingo/v3/core/silentzap	0%	❌
flamingo.me/flamingo/v3/core/zap	80%	✔
flamingo.me/flamingo/v3/examples/hello-world	0%	❌
flamingo.me/flamingo/v3/framework/cmd	5%	❌
flamingo.me/flamingo/v3/framework/config	49%	❌
flamingo.me/flamingo/v3/framework/controller	0%	❌
flamingo.me/flamingo/v3/framework/flamingo	38%	❌
flamingo.me/flamingo/v3/framework/flamingo/healthcheck	0%	❌
flamingo.me/flamingo/v3/framework	29%	❌
flamingo.me/flamingo/v3/framework/opencensus	78%	✔
flamingo.me/flamingo/v3/framework/prefixrouter	46%	❌
flamingo.me/flamingo/v3/framework/systemendpoint/application	0%	❌
flamingo.me/flamingo/v3/framework/systemendpoint	27%	❌
flamingo.me/flamingo/v3/framework/testutil	0%	❌
flamingo.me/flamingo/v3/framework/web	48%	❌
flamingo.me/flamingo/v3/framework/web/filter	0%	❌
Summary	43% (3750 / 8730)	❌