Update duckdb index files

.gitattributes

@@ -534,3 +534,4 @@ default/literature/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/interpersonal/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/matheducators.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
 default/mathematica.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text
+default/mechanics.meta/index.duckdb filter=lfs diff=lfs merge=lfs -text

default/mechanics.meta/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:92c20babc82a40867f7e2430c33aa0b3511876f8827142a6842b47a391c956c7
+size 4730880