add correct labels to pandas_function_request.md (#15381)

The should correct the labels added on a the "Request a Missing Pandas Function" template.

"? - Needs Triage" -> "Needs Triage" (https://github.com/rapidsai/cudf/issues?q=is%3Aopen+is%3Aissue+label%3A%22Needs+Triage%22)

and adds the "pandas" label (https://github.com/rapidsai/cudf/issues?q=is%3Aopen+is%3Aissue+label%3Apandas)

Authors:
  - Ray Bell (https://github.com/raybellwaves)
  - GALI PREM SAGAR (https://github.com/galipremsagar)

Approvers:
  - GALI PREM SAGAR (https://github.com/galipremsagar)
  - Jake Awe (https://github.com/AyodeAwe)

URL: #15381

.github/ISSUE_TEMPLATE/pandas_function_request.md

@@ -2,7 +2,7 @@
 name: Request a Missing Pandas Function
 about: Request GPU support for a function executed on the CPU in pandas accelerator mode.
 title: "[FEA]"
-labels: "? - Needs Triage, feature request"
+labels: "Needs Triage, feature request, cudf.pandas"
 assignees: ''
 
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