Change the travel date for analytics/dashboards_spec.rb

What does this MR do and why?

Hopefully this can fix gitlab-org/quality/engineering-productivity/master-broken-incidents#12590 (closed).

References

• Related to gitlab-org/quality/engineering-productivity/master-broken-incidents#12590 (closed)

How to set up and validate locally

for i in {1..5}; do TZ='CDT' be rspec './ee/spec/features/projects/analytics/dashboards_spec.rb:229'; done

for i in {1..5}; do TZ='CDT' be rspec './ee/spec/features/groups/analytics/dashboards_spec.rb:203'; done

MR acceptance checklist

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