lock nilaway to last working git commit (#782)

Author: AshleyDumaine

Makefile

@@ -370,7 +370,7 @@ TILT_VERSION             ?= 0.33.10
 KIND_VERSION             ?= 0.23.0
 CHAINSAW_VERSION         ?= v0.2.11
 HUSKY_VERSION            ?= v0.2.16
-NILAWAY_VERSION          ?= latest
+NILAWAY_VERSION          ?= d2274102dc2eab9f77cef849a5470a6ebf983125
 GOVULNC_VERSION          ?= v1.1.1
 MOCKGEN_VERSION          ?= v0.4.0
 GOWRAP_VERSION           ?= v1.4.0