dev: bump github.com/nats-io/nats-server/v2 from 2.11.4 to 2.11.15

[dependabot]

Bumps github.com/nats-io/nats-server/v2 from 2.11.4 to 2.11.15.

Release notes

Sourced from github.com/nats-io/nats-server/v2's releases.

Release v2.11.15

Changelog

Refer to the 2.11 Upgrade Guide for backwards compatibility notes with 2.10.x.

Go Version

• 1.25.8

Dependencies

• golang.org/x/crypto v0.49.0 (#7953)
• github.com/nats-io/jwt/v2 v2.8.1 (#7960)
• github.com/antithesishq/antithesis-sdk-go v0.6.0-default-no-op
• github.com/klauspost/compress v1.18.4
• github.com/nats-io/nats.go v1.49.0
• github.com/nats-io/nkeys v0.4.15

CVEs

• Fixes CVE-2026-33216, CVE-2026-33217, CVE-2026-33215 (affecting systems using MQTT)
• Fixes CVE-2026-33246 (affects systems using leafnodes and service imports)
• Fixes CVE-2026-33218 (affects systems using leafnodes)
• Fixes CVE-2026-33219 (affects systems using WebSockets)
• Fixes CVE-2026-33223, CVE-2026-33222 (affects systems using JetStream)
• Fixes CVE-2026-33248 (affects systems using mutual TLS)
• Fixes CVE-2026-33247 (affects systems providing credentials on the command line)
• Fixes CVE-2026-33249 (affects systems where client publish permissions should be restricted)

Improved

JetStream

• The stream peer-remove command now accepts a peer ID as well as a server name (#7952)

MQTT

• Protocol compliance has been improved, including more error handling on invalid or malformed MQTT packets (#7933)

Fixed

General

• Improved handling of duplicate headers
• A correctness bug when validating relative distinguished names has been fixed
• Secrets are now redacted correctly in trace logging (#7942)
• The expvar endpoint on the monitoring port now correctly redacts secrets from the command line arguments
• Trace headers are no longer incorrectly parsed when hitting max payload (#7954)
• The Nats-Trace-Dest message header for message tracing now requires that the client have publish permissions to the specified subject, an error is returned otherwise

... (truncated)

Commits

• bef17e1 Release v2.11.15
• e349b31 Cherry-picks for 2.11.15 (#62)
• 782a6df [FIXED] Avoid stalling read loop on leafnode ErrMinimumVersionRequired
• 74a5f6f Remove FIXME about auth callout nonce
• ea8ae87 Message tracing requires client publish permission for Nats-Trace-Dest
• 3fd43a0 Rebuild request info headers on leaf service imports
• 8dbf004 [FIXED] MQTT flappers use monotonic time
• 265a99b Update JWT and other dependencies
• d6d1dd9 Streaming parsing of WebSocket frames with limited memory allocations
• e6057af [FIXED] Avoid parsing trace headers from HPUB payload
• Additional commits viewable in compare view

Note
Automatic rebases have been disabled on this pull request as it has been open for over 30 days.

[halimi]

@dependabot rebase

[halimi]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved the merge conflicts by merging the latest HEAD into this branch. The conflicts in go.mod and go.sum were resolved by keeping the newer versions from HEAD — notably, origin/HEAD already contains github.com/nats-io/nats-server/v2 v2.14.2, which supersedes the v2.11.15 bump this PR was targeting. The merge commit (9288d8a) has been pushed.