CI: Fix cache refresh in scheduled nightly builds

Avoids a possible race condition between cache cleanup and use of
caches in the build jobs.

Also includes FFmpeg caches in the cleanup as the build action has
been fully updated with expected scheduled cleanups.

.github/workflows/scheduled.yaml

@@ -51,7 +51,7 @@ jobs:
             fi
           done <<< \
           "$(gh api repos/${GITHUB_REPOSITORY}/actions/caches \
-            --jq '.actions_caches.[] | select(.ref|test("refs/heads/master")) | select(.key|test(".+-(qt6|deps)-.+")) | select(.key|test(".+ffmpeg.+")|not) | {id, key} | join(";")')"
+            --jq '.actions_caches.[] | select(.ref|test("refs/heads/master")) | select(.key|test(".+-(qt6|ffmpeg|deps)-.+")) | {id, key} | join(";")')"
           echo '::endgroup::'
 
           echo '::group::Processing pull request cache entries'
@@ -76,6 +76,7 @@ jobs:
   ffmpeg-macos-build:
     name: Build FFmpeg for macOS
     runs-on: macos-13
+    needs: cache-cleanup
     strategy:
       fail-fast: true
       matrix:
@@ -129,6 +130,7 @@ jobs:
   ffmpeg-windows-build:
     name: Build FFmpeg for Windows
     runs-on: windows-2022
+    needs: cache-cleanup
     strategy:
       fail-fast: true
       matrix:
@@ -157,6 +159,7 @@ jobs:
   macos-build:
     name: Build macOS Dependencies
     runs-on: macos-13
+    needs: cache-cleanup
     strategy:
       fail-fast: true
       matrix:
@@ -210,6 +213,7 @@ jobs:
   windows-build:
     name: Build Windows Dependencies
     runs-on: windows-2022
+    needs: cache-cleanup
     strategy:
       fail-fast: true
       matrix:
@@ -282,6 +286,7 @@ jobs:
   macos-qt6-build:
     name: Build Qt6 (macOS)
     runs-on: macos-13
+    needs: cache-cleanup
     defaults:
       run:
         shell: zsh --no-rcs --errexit --pipefail {0}
@@ -322,6 +327,7 @@ jobs:
   windows-qt6-build:
     name: Build Qt6 (Windows)
     runs-on: windows-2022
+    needs: cache-cleanup
     strategy:
       fail-fast: true
       matrix: