Update duckdb index files

.gitattributes

@@ -583,3 +583,4 @@ default/retrocomputing.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/quant/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/reverseengineering.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/raspberrypi/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/retrocomputing/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/retrocomputing/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d656a0dc86f89d6f4ad0f41e69c588e9dd5d366c46e441933ca312a11c125d1b
+size 89403392