avoid devtools dep

this now has new system dep: r-lib/devtools@575ae4e

Author: lorenzwalthert

.github/workflows/hook-tests.yaml

@@ -88,7 +88,7 @@ jobs:
           }
           # avoid build-time deps
           options(install.packages.compile.from.source = "never") 
-          renv::install(c('testthat', 'devtools', 'git2r'))
+          renv::install(c('testthat', 'pkgload', 'git2r'))
           # some testing infrastructure we need is in R/testing.R
           renv::install(getwd())
         shell: Rscript {0}
@@ -101,7 +101,7 @@ jobs:
         shell: Rscript {0}
       - name: Test
         run: |
-          devtools::load_all()
+          pkgload::load_all()
           testthat::test_file(
             "tests/testthat/test-hooks.R",
             reporter = testthat::MultiReporter$new(list(