Update release_prep.sh (#107)

Add missing escaping for backticks

Author: alexeagle

.github/workflows/release_prep.sh

@@ -27,7 +27,7 @@ bazel_dep(name = "com_myorg_rules_mylang", version = "${TAG:1}")
 
 ## Using WORKSPACE
 
-Paste this snippet into your `WORKSPACE.bazel` file:
+Paste this snippet into your \`WORKSPACE.bazel\` file:
 
 \`\`\`starlark
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")