build: bump golang.org/x/net from 0.47.0 to 0.58.0 in /sandboxd

[dependabot]

Bumps golang.org/x/net from 0.47.0 to 0.58.0.

Commits

• acc78e0 go.mod: update golang.org/x dependencies
• 90d10f0 internal/http3: delete invalid Content-Length if declared in server handler
• 08abf4d internal/http3: infer headers when Content-Encoding is set but is empty
• 8d10596 http2: avoid deadlocks in wrapped ClientConn state callback
• 99c3b0a http2/hpack: build the table lookup maps lazily, only for encoders
• 5a920b1 http3: rework registration to allow using a fake network
• 7fd2842 quic: return an error from Accept after PacketConn reader exits
• 825111d quic: avoid busy-loop when keep-alive is blocked by congestion control
• a02ddfa http/httpproxy: prioritize lowercase proxy environment variables
• 574e5eb quic: halt conn goroutines on close when listener exits early
• Additional commits viewable in compare view

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[CMGS]

Applied in 318d270 (golang.org/x/net 0.47.0 -> 0.58.0).

Verified with the rest of the round: make go-lint (10x 0 issues.), make go-test, make lint, make test, the silkd suite on native linux/arm64, and a bare-metal round on a Ryzen 7 9700X (16c/60G) — sandboxd e2e x3 PASS with 16/16 smoke steps, warm-claim p50/p90 unchanged at 0.3ms across an A/B/A/B bench, and 84 clean full boots (0 failed units).

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.