build(deps): bump oss-fuzz-base/base-builder-go from 72f8378 to ffa5257 in /.clusterfuzzlite (#4080)

Bumps oss-fuzz-base/base-builder-go from `72f8378` to `ffa5257`.


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.clusterfuzzlite/Dockerfile

@@ -1,4 +1,4 @@
-FROM gcr.io/oss-fuzz-base/base-builder-go@sha256:72f83785e61158ad0fe0a4f571dfc238aebe2f1c731a4ba5d857e24a2350caa9
+FROM gcr.io/oss-fuzz-base/base-builder-go@sha256:ffa525743760f16e47d81051344c79c3f34c673aeebaf01f6afe7608530de68a
 
 COPY . $SRC/skipper
 COPY ./.clusterfuzzlite/build.sh $SRC/