skipper-internal: Update main fleet to version v0.21.268-1090

[MustafaSaber]

• build(deps): bump oss-fuzz-base/base-builder-go from f4b5582 to 74c2133 in /.clusterfuzzlite zalando/skipper#3377
• all: remove unused fields zalando/skipper#3382
• docs: clarify Ingress annotations zalando/skipper#3384
• build(deps): bump docker/build-push-action from 6.12.0 to 6.13.0 zalando/skipper#3385
• build(deps): bump actions/setup-go from 5.2.0 to 5.3.0 zalando/skipper#3386
• build(deps): bump coverallsapp/github-action from 2.3.4 to 2.3.6 zalando/skipper#3387
• build(deps): bump amazonlinux from 6e7b74e to 9b8a888 in /fuzz zalando/skipper#3390
• build(deps): bump oss-fuzz-base/base-builder-go from 74c2133 to 8cacfff in /.clusterfuzzlite zalando/skipper#3395
• build(deps): bump the all-go-mod-patch-and-minor group across 1 directory with 4 updates zalando/skipper#3394
• build(deps): bump actions/setup-python from 5.3.0 to 5.4.0 zalando/skipper#3393
• build(deps): bump amazonlinux from 9b8a888 to 8217eec in /fuzz zalando/skipper#3392
• build(deps): bump github.com/golang/glog from 1.2.2 to 1.2.4 in the go_modules group zalando/skipper#3396
• Add a test case on input contract validation zalando/skipper#3315
• build(deps): bump docker/setup-qemu-action from 3.3.0 to 3.4.0 zalando/skipper#3400
• build(deps): bump docker/setup-buildx-action from 3.8.0 to 3.9.0 zalando/skipper#3399
• build(deps): bump oss-fuzz-base/base-builder-go from 8cacfff to 7031d0f in /.clusterfuzzlite zalando/skipper#3401
• filters/auth: add jwtMetrics benchmark zalando/skipper#3402
• jwt: reduce heap allocations in jwt.Parse zalando/skipper#3403

follow up on #8864

[MustafaSaber]

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[vlktna]

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[AlexanderYastrebov]

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