Revert "docgen: --cache off for tests"
Revert "docgen: --cache off for tests"

This reverts commit 0a8a7a57e7a6b4b5a0d1523bde57b2a4b93fa50a.

This workaround is no longer necessary.

raulgrell/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig