[R] Update NEWS.md with missing changes for 13.0.0

[thisisnic]

Describe the bug, including details regarding any error messages, version, and platform.

The following updates were missed in the update for NEWS.md for 13.0.0:

• 1a038ad [R] Update case_when() binding to match changes in dplyr #32282: [R] Update case_when() binding to match changes in dplyr (GH-32282: [R] Update case_when() binding to match changes in dplyr #35502)
• 11780b9 [R] Tests failures on R < 4.0 due to data.frame conversion #35425: [R] Tests failures on R < 4.0 due to data.frame conversion (GH-35425: [R] Tests failures on R < 4.0 due to data.frame conversion #35432)

Component(s)

R