Revert "ci: explicitly cache .rustup"

This reverts commit 6e489c0.

Author: auxesis

.github/workflows/test-eql.yml

@@ -48,15 +48,6 @@ jobs:
           cache: true # [default: true] cache mise using GitHub's cache
           cache_key_prefix: "mise-v3"
 
-      - name: Cache Rust directories
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.rustup
-          key: rust-cache-${{ runner.os }}-${{ hashFiles('mise.toml') }}
-          restore-keys: |
-            rust-cache-${{ runner.os }}-
-
       - name: Setup database (Postgres ${{ matrix.postgres-version }})
         run: |
           mise run postgres:up postgres-${POSTGRES_VERSION} --extra-args "--detach --wait"