What's Changed
- fix(spanner): drain query streams when seen_last is true by @olavloite in #5846
- fix(spanner): drain query stream on drop if last=true by @olavloite in #5858
- fix(spanner): retry transport errors by @olavloite in #5859
- fix(auth): retry more transient errors by @dbolduc in #5866
Full Changelog: release-20260604...release-20260612