Update embedded pkgcache

For r-lib/pkgcache#139

Author: gaborcsardi

src/library/pkgcache/DESCRIPTION

@@ -29,7 +29,7 @@ Language: en-US
 Roxygen: list(markdown = TRUE, r6 = FALSE)
 Config/roxygen2/version: 8.0.0
 NeedsCompilation: yes
-Packaged: 2026-06-05 11:11:27 UTC; gaborcsardi
+Packaged: 2026-06-11 11:33:51 UTC; gaborcsardi
 Author: Gábor Csárdi [aut, cre],
   Posit Software, PBC [cph, fnd] (ROR: <https://ror.org/03wc8by49>)
 Maintainer: Gábor Csárdi <csardi.gabor@gmail.com>

src/library/pkgcache/R/metadata-cache.R

@@ -602,7 +602,7 @@ re_ppm_linux <- function() {
     "(?<base>.*/)",
     "(?<repo>[^/]+)/",
     "__linux__/",
-    "(?<distro>[a-zA-Z0-9]+)/",
+    "(?<distro>[a-zA-Z0-9_]+)/",
     "(?<version>latest|[-0-9]+)",
     "$"
   )