build(snap): Fix snap package not buildable in v1.11.0 (#4578)

* fix(snap): Fix missing CMake build dependency

Signed-off-by: 林博仁(Buo-ren Lin) <Buo.Ren.Lin@gmail.com>

* fix(snap): Use core20 for compatible versions of CMake

Fixes #4574.

Signed-off-by: 林博仁(Buo-ren Lin) <Buo.Ren.Lin@gmail.com>

* build(snap): Drop unused build packages

Refer-to: David Knaack comment at Snap not buildable in v1.11.0 · Issue starship#4574 · starship/starship <starship#4574 (comment)>
Signed-off-by: 林博仁(Buo-ren Lin) <Buo.Ren.Lin@gmail.com>

Signed-off-by: 林博仁(Buo-ren Lin) <Buo.Ren.Lin@gmail.com>

snapcraft.yaml

@@ -1,5 +1,5 @@
 name: starship
-base: core18
+base: core20
 adopt-info: starship
 summary: The minimal, blazing-fast, and infinitely customizable prompt for any shell!
 description: |
@@ -57,7 +57,7 @@ parts:
     source: https://github.com/starship/starship.git
     #source-tag: v$SNAPCRAFT_PROJECT_VERSION
     build-packages:
-      - libssl-dev
+      - cmake
       - pkg-config
     override-build: |
       last_committed_tag="$(git describe --tags --abbrev=0)"