use node 18 and clear pipeline warnings (#134)

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## Description

As part of an internal Formidable Open Source audit, we're going through
and updating some GH actions to no longer use unsupported versions of
node. Also, removing them from our testing pipelines.

I also noticed we weren't utilizing a cache for yarn, so I added that
into `setup-node` action to speed things up slightly.


## Checklist:

- [x] All tests are passing
- [x] Type definitions, if updated, pass both `test-ts-defs` and
`test-ts-usage`
- [x] Benchmark performance has not significantly decreased
- [x] Bundle size has not been significantly impacted
- [x] The bundle size badge has been updated to reflect the new size

---------

Co-authored-by: Sawyer Burnett <[email protected]>

.github/workflows/ci.yml

@@ -17,8 +17,6 @@ jobs:
           - ubuntu-latest
           - windows-latest
         node_version:
-          - 14
-          - 16
           - 18
     name: Node ${{ matrix.node_version }} on ${{ matrix.os }}
     steps:
@@ -27,10 +25,11 @@ jobs:
         run: |
           git config --global core.autocrlf false
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup node
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
+          cache: "yarn"
           node-version: ${{ matrix.node_version }}
       - name: Install Dependencies
         run: yarn install --frozen-lockfile

.github/workflows/release.yml

@@ -16,9 +16,10 @@ jobs:
       packages: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
+          cache: "yarn"
           node-version: 18
 
       - name: Install dependencies