Omits unneeded dependencies

[goergen95]

• removes curl, progressr, rvest, stringr, and tidyselect from Import
• removes SPEI from suggests and adds progressr, and rvest
• omits using those packages from code

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 67.64706% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 84.46%. Comparing base (837049e) to head (7a6491f). Report is 98 commits behind head on main.

Files	Patch %	Lines
R/get_soilgrids.R	44.44%	20 Missing :warning:
R/get_resources.R	66.66%	1 Missing :warning:
R/utils.R	87.50%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #260 +/- ## ========================================== + Coverage 83.25% 84.46% +1.21% ========================================== Files 50 49 -1 Lines 2096 2247 +151 ========================================== + Hits 1745 1898 +153 + Misses 351 349 -2 ```

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