ci: Trigger actions on pull requests to rc/v* branches

[niloc132]

With new rc/v* branches created, we need the actions to run on those branches as well.

Cherry-pick #5630

[niloc132]

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ERROR [0.359s]: test_agg_with_options (test_table.TableTestCase)
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Traceback (most recent call last):
  File "/project/tests/test_table.py", line 335, in test_agg_with_options
    aggs = [unique(cols=["ua = a", "ub = b"], include_nulls=True, non_unique_sentinel=np.uint32(-1))]
OverflowError: Python integer -1 out of bounds for uint32

I believe we can cherry-pick 38b9241155 (aka #5621, #5630) to fix this.