Add missing ripgrep dependency for the test case

Add the `ripgrep` dependency that is used in the `prefix-replacement`
test.  Since it is missing, the test never really greps and therefore
does not actually test.

Signed-off-by: Michał Górny <mgorny@quansight.com>

Author: mgorny

recipe/meta.yaml

@@ -307,6 +307,7 @@ outputs:
       requires:
         - {{ stdlib('c') }}
         - {{ compiler('c') }}
+        - ripgrep
       commands:
         - VER=${PKG_VERSION%.*}    # [not win]
         - VERABI=${VER}            # [not win]