snapcraft: Pin go to 1.21

Signed-off-by: Thomas Parrott <[email protected]>

snapcraft.yaml

@@ -545,7 +545,7 @@ parts:
     source-depth: 1
     plugin: nil
     build-snaps:
-      - go
+      - go/1.21/stable
     override-pull: |
       [ "$(uname -m)" = "riscv64" ] && exit 0
 
@@ -1356,7 +1356,7 @@ parts:
       - python3-dev
       - python3-venv
     build-snaps:
-      - go
+      - go/1.21/stable
     stage-packages:
       - acl
       - attr
@@ -1470,7 +1470,7 @@ parts:
       - lxd
       - sqlite
     build-snaps:
-      - go
+      - go/1.21/stable
     plugin: nil
     override-pull: |
       craftctl default
@@ -1529,7 +1529,7 @@ parts:
   snap-query:
     source: snap-query/
     build-snaps:
-      - go
+      - go/1.21/stable
     plugin: nil
     override-build: |
       set -ex