vendor: golang.org/x/net v0.59.0

Notable changes:

- all: upgrade go directive to at least 1.26.0
- http2: deprecate Transport and Server
- http2: use IDNA Lookup profile, not raw Punycode translation
    - addresses https://github.com/golang/go/issues/81010
- internal/httpcommon: remove Host header from server request

full diff: https://github.com/golang/net/compare/v0.58.0...v0.59.0

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>