chore(deps): bump google.golang.org/grpc from 1.80.0 to 1.81.0 in /api in the gomod group across 1 directory

[dependabot]

Bumps the gomod group with 1 update in the /api directory: google.golang.org/grpc.

Updates google.golang.org/grpc from 1.80.0 to 1.81.0

Release notes

Sourced from google.golang.org/grpc's releases.

Release 1.81.0

Behavior Changes

• balancer/rls: Switch gauge metrics to asynchronous emission (once per collection cycle) to reduce telemetry noise and align with other gRPC language implementations. (#8808)

Dependencies

• Minimum supported Go version is now 1.25. (#8969)

Bug Fixes

• xds: Use the leaf cluster's security config for the TLS handshake instead of the aggregate cluster's config. (#8956)
• transport: Send a RST_STREAM when receiving an END_STREAM when the stream is not already half-closed. (#8832)
• xds: Fix ADS resource name validation to prevent a panic. (#8970)

New Features

• grpc/stats: Add support for custom labels in per-call metrics (gRFC A108). (#9008)
• xds: Add support for Server Name Indication (SNI) and SAN validation (gRFC A101). Disabled by default. To enable, set GRPC_EXPERIMENTAL_XDS_SNI=true environment variable. (#9016)
• xds: Add support to control which fields get propagated from ORCA backend metric reports to LRS load reports (gRFC A85). Disabled by default. To enable, set GRPC_EXPERIMENTAL_XDS_ORCA_LRS_PROPAGATION=true. (#9005)
• xds: Add metrics to track xDS client connectivity and cached resource state (gRFC A78). (#8807)
• stats/otel: Enhance grpc.subchannel.disconnections metric by adding disconnection reason to the grpc.disconnect_error label (gRFC A94). This provides granular insights into why subchannels are closing. (#8973)
• mem: Add mem.Buffer.Slice() API to slice the buffer like a slice. (#8977)
  • Special Thanks: @​ash2k

Performance Improvements

• alts: Pool read buffers to lower memory utilization when sockets are unreadable. (#8964)
• transport: Pool HTTP/2 framer read buffers to reduce idle memory consumption. Currently limited to Linux for ALTS and non-encrypted transports (TCP, Unix). To disable, set GRPC_GO_EXPERIMENTAL_HTTP_FRAMER_READ_BUFFER_POOLING=false and report any issues. (#9032)

Commits

• cb18228 Change version to 1.81.0 (#9062)
• 96748f9 Cherry-pick #9105 to 1.81.x (#9106)
• 9183222 Cherry pick #9055, #9032 to v1.81.x (#9095)
• 5cba6da Revert "deps: update dependencies for all modules (#9065)" (#9067)
• af8a936 deps: update dependencies for all modules (#9065)
• cdc60df transport: optimize heap allocations in ready reader and update syscall conne...
• 208d053 xds/resolver: pass complete XDSConfig in RPC context for HTTP filters (gRFC A...
• 50fe1cc test: Fix flaky test TestServerStreaming_ClientCallRecvMsgTwice in `end2end...
• d574bad build(deps): bump go.opentelemetry.io/otel/sdk from 1.42.0 to 1.43.0 (#9050)
• b8bf4d0 build(deps): bump go.opentelemetry.io/otel/sdk from 1.42.0 to 1.43.0 in /inte...
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