[CI:DOCS] GHA: Use stable go for Mac/Win builds

Having hard-coded versions burried under a hidden directory is ripe for
maintenance headaches.  Use the latest 'stable' version, since this will
be "close enough" to what we test in CI.

Ref: https://github.com/containers/podman/discussions/19404

Signed-off-by: Chris Evich <cevich@redhat.com>

.github/workflows/mac-pkg.yml

@@ -70,7 +70,7 @@ jobs:
       if: steps.check.outputs.buildamd == 'true' || steps.check.outputs.buildarm == 'true'
       uses: actions/setup-go@v4
       with:
-        go-version: '1.18'
+        go-version: stable
     - name: Create Keychain
       if: steps.check.outputs.buildamd == 'true' || steps.check.outputs.buildarm == 'true'
       run: |

.github/workflows/upload-win-installer.yml

@@ -45,7 +45,7 @@ jobs:
       uses: actions/setup-go@v4
       if: steps.check.outputs.already-exists != 'true'
       with:
-        go-version: 1.18
+        go-version: stable
     - name: Setup Signature Tooling
       if: steps.Check.outputs.already-exists != 'true'
       run: |