Auto merge of #3801 - rust-lang:renovate/actions-cache-2.x, r=Turbo87

Update actions/cache action to v2.1.6

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/cache](https://togithub.com/actions/cache) | action | patch | `v2.1.4` -> `v2.1.6` |

---

### Release Notes

<details>
<summary>actions/cache</summary>

### [`v2.1.6`](https://togithub.com/actions/cache/releases/v2.1.6)

[Compare Source](https://togithub.com/actions/cache/compare/v2.1.5...v2.1.6)

-   Catch unhandled "bad file descriptor" errors that sometimes occurs when the cache server returns non-successful response (actions/cache#596)

### [`v2.1.5`](https://togithub.com/actions/cache/releases/v2.1.5)

[Compare Source](https://togithub.com/actions/cache/compare/v2.1.4...v2.1.5)

-   Fix permissions error seen when extracting caches with GNU tar that were previously created using BSD tar (actions/cache#527)

</details>

---

### Configuration

📅 **Schedule**: At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box.

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/rust-lang/crates.io).

Author: bors

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
 
       # Current size as of 2021-02-15: ~105 MB
       - name: Cache cargo registry and git deps
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.6
         with:
           path: |
             ~/.cargo/registry/cache
@@ -92,7 +92,7 @@ jobs:
           echo "::set-output name=version::$(rustc -V)"
 
       - name: Cache cargo build
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.6
         with:
           path: target
           key: v2-${{ runner.os }}-cargo-clippy-${{ steps.rustc.outputs.version }}-${{ hashFiles('**/Cargo.lock') }}
@@ -167,14 +167,14 @@ jobs:
       #
       # Current size as of 2021-02-15: ~15 MB
       - name: Cache cargo binaries
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.6
         with:
           path: ~/.cargo/bin
           key: ${{ runner.os }}-cargo-bin-${{ matrix.rust }}-${{ hashFiles('.diesel_version') }}-v3
 
       # Current size as of 2021-02-15: ~105 MB
       - name: Cache cargo registry and git deps
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.6
         with:
           path: |
             ~/.cargo/registry/cache
@@ -200,7 +200,7 @@ jobs:
 
       # Current size as of 2021-02-12: ~325 MB
       - name: Cache cargo build
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.6
         with:
           path: target
           key: v2-${{ runner.os }}-cargo-build-target-${{ steps.rustc.outputs.version }}-${{ hashFiles('**/Cargo.lock') }}