fix(ci): install RPostgres for audit workflows (#172)

## Summary

- Install RPostgres before running the missing-binaries audit.
- Install RPostgres before running weekly patch proposal and automatic patch workflows.

## Validation

- `prek run --files .crow/auto-apply-patches.yaml .crow/weekly-audit-missing.yaml .crow/weekly-patch-proposals.yaml`
- `crow lint .crow/`
- `git diff --check`

Reviewed-on: #172

.crow/auto-apply-patches.yaml

@@ -58,7 +58,7 @@ steps:
       - git clone -q https://pat-s:$$REPO_RO_TOKEN@git.devxy.io/devxy/build-cran-binaries.git .
       - mkdir -p /mnt/cache/R-pkgs
       - rm -rf /mnt/cache/R-pkgs/00LOCK-*
-      - UVR_R_BIN=/opt/R/$R_VERSION/bin/R local/uvr-install.sh httr2 jsonlite
+      - UVR_R_BIN=/opt/R/$R_VERSION/bin/R local/uvr-install.sh RPostgres httr2 jsonlite
       - /opt/R/$R_VERSION/bin/Rscript local/propose-patches.R --open-pr --limit $PATCH_LIMIT
     backend_options:
       kubernetes:

.crow/weekly-audit-missing.yaml

@@ -147,7 +147,7 @@ steps:
       - mkdir -p /mnt/cache/packages /mnt/cache/R-pkgs
       - rm -rf /mnt/cache/R-pkgs/00LOCK-*
       - /opt/R/$R_VERSION/bin/Rscript local/install-bincraft.R
-      - UVR_R_BIN=/opt/R/$R_VERSION/bin/R local/uvr-install.sh httr2 jsonlite
+      - UVR_R_BIN=/opt/R/$R_VERSION/bin/R local/uvr-install.sh RPostgres httr2 jsonlite
       - /opt/R/$R_VERSION/bin/R -q -e 'source("local/weekly-missing-binaries-audit.R")'
     backend_options:
       docker:

.crow/weekly-patch-proposals.yaml

@@ -53,7 +53,7 @@ steps:
       - git clone -q https://pat-s:$$REPO_RO_TOKEN@git.devxy.io/devxy/build-cran-binaries.git .
       - mkdir -p /mnt/cache/R-pkgs
       - rm -rf /mnt/cache/R-pkgs/00LOCK-*
-      - UVR_R_BIN=/opt/R/$R_VERSION/bin/R local/uvr-install.sh httr2 jsonlite
+      - UVR_R_BIN=/opt/R/$R_VERSION/bin/R local/uvr-install.sh RPostgres httr2 jsonlite
       - /opt/R/$R_VERSION/bin/Rscript local/propose-patches.R --open-issue
       - /opt/R/$R_VERSION/bin/Rscript local/proposal-tracking.R --open-issue
     backend_options: