time: ParseInLocation error [1.17 backport]

[gopherbot]

@zhouguangyuan0718 requested issue #49284 to be considered for backport to the next 1.17 minor release.

@gopherbot please open backport to 1.16 and 1.17

[gopherbot]

Change https://golang.org/cl/361955 mentions this issue: [release-branch.go1.17] time: fix looking for zone offset when date is close to a zone transition

[heschi]

@ianlancetaylor This cherrypick's CL still needs review.

[ianlancetaylor]

Now reviewed, needs a Trust+1.

[gopherbot]

Closed by merging b7651e5 to release-branch.go1.17.