Update skipper version, step 1/2

[RomanZavodskikh]

• build(deps): bump github.com/prometheus/client_golang from 1.19.0 to 1.19.1 build(deps): bump github.com/prometheus/client_golang from 1.19.0 to 1.19.1 zalando/skipper#3077
• build(deps): bump google.golang.org/protobuf from 1.34.0 to 1.34.1 build(deps): bump google.golang.org/protobuf from 1.34.0 to 1.34.1 zalando/skipper#3076
• build(deps): bump golang.org/x/net from 0.24.0 to 0.25.0 build(deps): bump golang.org/x/net from 0.24.0 to 0.25.0 zalando/skipper#3074
• phc: refactor testcases phc: refactor testcases zalando/skipper#3071
• build(deps): bump github.com/testcontainers/testcontainers-go from 0.30.0 to 0.31.0 build(deps): bump github.com/testcontainers/testcontainers-go from 0.30.0 to 0.31.0 zalando/skipper#3075
• build(deps): bump actions/checkout from 4.1.5 to 4.1.6 build(deps): bump actions/checkout from 4.1.5 to 4.1.6 zalando/skipper#3082
• build(deps): bump alpine from c5b1261 to 77726ef in /packaging build(deps): bump alpine from c5b1261 to 77726ef in /packaging zalando/skipper#3083
• Added max-unhealthy-endpoints-ratio cmdline parameter for PHC Added max-unhealthy-endpoints-ratio cmdline parameter for PHC zalando/skipper#3081

FYI zalando/skipper@v0.21.91...v0.21.99

[RomanZavodskikh]

👍

[MustafaSaber]

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