googlecloudspannerreceiver: Update dependencies

[dashpole]

Component(s)

receiver/googlecloudspanner

Describe the issue you're reporting

#30370 and #29830 were auto-closed since the previous codeowner didn't act on them. We should keep our dependencies up-to-date to ensure we stay on maintained versions of dependencies.

This issue is complete when:

• github.com/mitchellh/hashstructure is updated to v2
• github.com/renekroon/ttlcache/v2 is updated to v3

[github-actions]

Pinging code owners for receiver/googlecloudspanner: @dashpole @dsimil @KiranmayiB @harishbohara11. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[codeboten]

#36209

[codeboten]

#36202

[codeboten]

One more update that needs addressing #36317