Update snapshots for Bioc release

Plus add some docs on what to do when the bioc
snapshots fail because of the new Bioc release.

tests/testthat/_snaps/platform.md

@@ -331,23 +331,24 @@
       35         3.15       4.2 out-of-date
       36         3.16       4.2 out-of-date
       37         3.17       4.3 out-of-date
-      38         3.18       4.3     release
-      39         3.19       4.4       devel
-      40         3.19       4.5      future
+      38         3.18       4.3 out-of-date
+      39         3.19       4.4     release
+      40         3.20       4.4       devel
+      41         3.20       4.5      future
 
 # bioc_release_version, bioc_devel_version
 
     Code
       bioc_release_version(forget = TRUE)
     Output
-      [1] '3.18'
+      [1] '3.19'
 
 ---
 
     Code
       bioc_devel_version(forget = TRUE)
     Output
-      [1] '3.19'
+      [1] '3.20'
 
 # bioc_repos
 

tests/testthat/test-platform.R

@@ -185,6 +185,13 @@ test_that("bioc_version", {
   })
 })
 
+# If this or the next test fails, that means that we potentially
+# need to update our Bioc metadata. If the R version -> Bioc version
+# mapping is final, then we update it. Otherwise we don't. E.g.
+# R 4.4 uses Bioc 3.19 right now, but eventually will use Bioc 3.20,
+# so we don't update for Bioc 3.19, only for Bioc 3.20.
+# If we don't update the metadata, we just update the test snapshots.
+
 test_that("bioc_version_map", {
   on.exit(bioconductor$.internal$clear_cache())
   bioconductor$.internal$clear_cache()