chore(spanner): bump google-cloud-spanner to 3.71.0 in samples

[sakthivelmanii]

Update samples/samples/requirements.txt to google-cloud-spanner==3.71.0 to include Cloud Spanner Queues mutation API (Batch.send and Batch.ack).

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Code Review

This pull request updates the google-cloud-spanner dependency version from 3.66.0 to 3.71.0 in the samples requirements file. There are no review comments, and I have no feedback to provide.

[rahul2393]

@parthea how do we configure dependabot to automatically raise such PRs?

[parthea]

PR #18221 which includes google-cloud-spanner==3.71.0 was only merged recently (< 24 hours). The config file for renovate bot is set up to run on a weekly schedule:

google-cloud-python/renovate.json

Line 6 in c5cc60a

"schedule:weekly"

. We should expect renovate bot to propose changes weekly.

Separately, it looks like renovate bot may be stuck. I'll take a look. The last update proposed was in #17162