Bumps [golang.org/x/net](https://github.com/golang/net) from 0.48.0 to 0.49.0.

Commits

d977772 go.mod: update golang.org/x dependencies
eea413e internal/http3: use go1.25 synctest.Test instead of go1.24 synctest.Run
9ace223 websocket: add missing call to resp.Body.Close
7d3dbb0 http2: buffer the most recently received PRIORITY_UPDATE frame
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--- ## Summary by cubic Upgrade golang.org/x/net to v0.49.0 to pull in bug fixes (websocket body close, improved HTTP/2 PRIORITY_UPDATE handling) and keep x/* modules current. No application code changes; only go.mod/go.sum updates. - **Dependencies** - Direct: golang.org/x/net v0.48.0 → v0.49.0 - Indirect: x/crypto v0.47.0, x/mod v0.31.0, x/sys v0.40.0, x/text v0.33.0, x/tools v0.40.0 ^{Written for commit 7dfbe139420f0a0478ae2884dd1b058bb1393ddf. Summary will update on new commits.}