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GH-37614: [R][CI] Update CI jobs due to duckdb repo moving (#37615)

### Rationale for this change

Duckdb have moved the R package to a separate repo

### What changes are included in this PR?

Updates the duckdb R package dev repo 

### Are these changes tested?

No

### Are there any user-facing changes?

No
* Closes: #37614

Authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>