internal/ci: use go1.20.3 for releases

go1.20.3 (released 2023-04-04) includes security fixes to the go/parser,
html/template, mime/multipart, net/http, and net/textproto packages, as
well as bug fixes to the compiler, the linker, the runtime, and the time
package.

Pick up this latest version ahead of our release of v0.6.0-alpha.1

Signed-off-by: Paul Jolly <paul@myitcv.io>
Change-Id: I867c9b7793aea7350088dd24fa09cc5987483fb8
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/552503
Unity-Result: CUEcueckoo <cueckoo@cuelang.org>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>

.github/workflows/release.yml

@@ -66,7 +66,7 @@ jobs:
         uses: actions/setup-go@v4
         with:
           cache: false
-          go-version: 1.20.2
+          go-version: 1.20.3
       - name: Setup qemu
         uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx

.github/workflows/trybot_dispatch.yml

@@ -28,7 +28,7 @@ jobs:
         run: |-
           cat <<EOD >> $GITHUB_OUTPUT
           value<<DOE
-          {"type":"trybot","CL":552206,"patchset":12,"targetBranch":"master","ref":"refs/changes/06/552206/12"}
+          {"type":"trybot","CL":552503,"patchset":2,"targetBranch":"master","ref":"refs/changes/03/552503/2"}
           DOE
           EOD
       - if: github.event.client_payload.type != 'trybot'

internal/ci/github/gen_trybot_dispatch.cue

@@ -1,6 +1,6 @@
 package github
 
 dummyDispatch: {
-    CL:       552206
-    patchset: 12
+    CL:       552503
+    patchset: 2
 }

internal/ci/repo/repo.cue

@@ -35,7 +35,7 @@ latestStableGo: "1.20.x"
 // Use a specific latest version for release builds.
 // Note that we don't want ".x" for the sake of reproducibility,
 // so we instead pin a specific Go release.
-pinnedReleaseGo: "1.20.2"
+pinnedReleaseGo: "1.20.3"
 
 goreleaserVersion: "v1.16.2"