ci: pin upstream workflow actions (#321)

Author: DanielleHuisman

.github/workflows/upstream.yml

@@ -17,16 +17,16 @@ jobs:
         steps:
             - name: Generate GitHub App token
               id: app-token
-              uses: actions/create-github-app-token@v3
+              uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3 # v3.1.1
               with:
-                  app-id: ${{ secrets.APP_ID }}
+                  client-id: ${{ secrets.APP_ID }}
                   private-key: ${{ secrets.APP_PRIVATE_KEY }}
 
             - name: Checkout
-              uses: actions/checkout@v6
+              uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
             - name: Set up Rust toolchain
-              uses: actions-rust-lang/setup-rust-toolchain@v1
+              uses: actions-rust-lang/setup-rust-toolchain@2b1f5e9b395427c92ee4e3331786ca3c37afe2d7 # v1.16.0
 
             - name: Check for upstream releases
               run: cargo run -p scripts --bin upstream