go-hep/hep: Release v0.38.0

98a00804 all: bump deps 028c454b groot/rtree: add support for reading packed-struct 236817c7 all: bump ulikunitz/xz@v0.5.15 54a21f95 all: use go tool brio-gen 7dc9fd25 all: use go tool embedmd 89bd3d37 all: use go tool goimports 34f83854 all: use go tool stringer 48b6cf6d all: use go tool directive 7c3826b3 all: bump Go-1.25, drop Go-1.23 c2db4ec0 all: bump to npyio@v0.11.0 3469cfd5 groot/rhist: make loadFrom a testing.T.Helper 5ba9a4ce groot: better STL-based classes streamer-element handling 27d6e0cf groot: introduce groot-compat rvers.StreamerBaseSTL 4b93bad9 all: bump to ROOT-6.36.02 abce83c4 groot/rsrv: use rtests.XrdRemote throughout dec14d6e hplot: make {Horiz,Vert}Line implement DataRanger 44e02b3d groot: use local geant4 histograms file b40689bc all: remove last remnants of github.com/go-hep 627e8ec3 all: point badges and docs to codeberg/go-hep