updated loading in activation patching demo to use transformer bridge#1011

jlarson4 merged 9 commits intodev-3.x-canaryTransformerLensOrg/TransformerLens:dev-3.x-canaryfrom

activation_patching_demo_transformer_bridge_migrationTransformerLensOrg/TransformerLens:activation_patching_demo_transformer_bridge_migrationCopy head branch name to clipboard