Remove github actions cache (#8020)

Running into issues with cache when trying to upgrade V8. Based on the analysis in
https://github.com/denoland/deno/pull/7903#issuecomment-706252380 
we know the cache is not providing much benefit.

.github/workflows/ci.yml

@@ -94,60 +94,6 @@ jobs:
           rustc --version
           cargo --version
 
-      - name: Configure cargo data directory
-        # After this point, all cargo registry and crate data is stored in
-        # $GITHUB_WORKSPACE/.cargo_home. This allows us to cache only the files
-        # that are needed during the build process. Additionally, this works
-        # around a bug in the 'cache' action that causes directories outside of
-        # the workspace dir to be saved/restored incorrectly.
-        run: echo "::set-env name=CARGO_HOME::$(pwd)/.cargo_home"
-
-      - name: Cache
-        uses: actions/cache@v2
-        with:
-          # Note: crates from the denoland/deno git repo always get rebuilt,
-          # and their outputs ('deno', 'libdeno.rlib' etc.) are quite big,
-          # so we cache only those subdirectories of target/{debug|release} that
-          # contain the build output for crates that come from the registry.
-          path: |-
-            .cargo_home
-            target/*/.*
-            target/*/build
-            target/*/deps
-            target/*/gn_out
-          key: deno-${{ matrix.os }}-${{ matrix.kind }}-${{ hashFiles('Cargo.lock') }}
-          restore-keys: |
-            deno-${{ matrix.os }}-${{ matrix.kind }}-
-
-        # It seems that the 'target' directory does not always get restored
-        # from cache correctly on MacOS. In the build log we see the following:
-        #
-        #   Fresh serde_derive v1.0.115
-        #
-        # But a little while after that Cargo aborts because 'serde_derive' is
-        # now nowhere to be found. We're not the only ones experiencing this,
-        # see https://github.com/actions-rs/cargo/issues/111.
-        #
-        #   error[E0463]: can't find crate for `serde_derive`
-        #   ##[error]   --> /Users/runner/.cargo/registry/src/github.com-
-        #       |           1ecc6299db9ec823/serde-1.0.115/src/lib.rs:285:1
-        #       |
-        #   285 | extern crate serde_derive;
-        #       | ^^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
-      - name: Work around MacOS + Cargo + Github Actions cache bug
-        if: runner.os == 'macOS'
-        run: |
-          cargo clean --locked --release \
-                      -p ast_node \
-                      -p is-macro \
-                      -p serde_derive \
-                      -p swc_ecma_codegen \
-                      -p swc_ecma_codegen_macros \
-                      -p swc_ecma_parser \
-                      -p swc_ecma_parser_macros \
-                      -p swc_visit \
-                      -p swc_visit_macros
-
       - name: lint.py
         if: matrix.kind == 'lint'
         run: python ./tools/lint.py