freeze scaffeine so it still extracts on JDK 8

Author: SethTisue

proj/scaffeine.conf

@@ -1,8 +1,14 @@
-// https://github.com/blemale/scaffeine.git#main
+// https://github.com/blemale/scaffeine.git#d3c2cf0b32a266730823e974848e15304811336d  # was main
+
+// frozen at a known-green SHA before a JGit upgrade in the build to a version
+// that requires JDK 11, preventing the build from even extracting on JDK 8
+
+// we could probably fork to remove the offending plugin, but it seems acceptable
+// to just freeze instead
 
 vars.proj.scaffeine: ${vars.base} {
   name: "scaffeine"
-  uri: "https://github.com/blemale/scaffeine.git#3d304ca03e6c718f2e938eefb098f592c5337996"
+  uri: "https://github.com/blemale/scaffeine.git#d3c2cf0b32a266730823e974848e15304811336d"
 
   extra.settings: ${vars.base.extra.settings} [
     // resolve version conflict (from sbt-scoverage, probably?)