fix: ugdate to go@1.18

Bob supports now go>=1.18. Update all references
to old versions.

Change-Id: I058cda97af328c10e982e75c0746f0e4a0bf1f06
Signed-off-by: Sebastian Birunt <sebastian.birunt@arm.com>

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     name: Commit checks
     strategy:
       matrix:
-        go: ["1.13"]
+        go: ["1.18"]
         os: [ubuntu-latest]
         python: ["3.x"]
     runs-on: ${{ matrix.os }}

WORKSPACE

@@ -91,7 +91,7 @@ go_dependencies()
 go_rules_dependencies()
 
 # 1.18 for latest rules_go and Gazelle.
-# Bob itself supports >=1.11
+# Bob itself supports >=1.18
 go_register_toolchains(version = "1.18")
 
 # TODO: Fix config system import structure

go.mod

@@ -1,10 +1,17 @@
 module github.com/ARM-software/bob-build
 
-go 1.11
+go 1.18
 
 require (
 	github.com/google/blueprint v0.0.0-20200402195805-6957a46d38c9
 	github.com/stretchr/testify v1.6.0
 )
 
+require (
+	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/objx v0.1.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)
+
 replace github.com/google/blueprint v0.0.0-20200402195805-6957a46d38c9 => ./blueprint