Remove deny action, setup ignores.

Author: bitshifter

.github/workflows/cargo-deny.yml

@@ -0,0 +1,14 @@
+# Generated by Cargo
+# will have compiled files and executables
+debug
+target
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# Generated by cargo mutants
+# Contains mutation testing data
+**/mutants.out*/