Remove dependabot for GitHub Actions

- It only seems to catch some dependencies, not all
- Its PRs (without batching) are kind of noisy
- Despite the GitHub docs saying otherwise, it seems to open PRs for
  forks...
- GitHub Actions seem to use semantic versioning pretty much
  consistently, so this should hopefully work out without explicit
  pinning.

.github/dependabot.yml

@@ -1,6 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"

.github/workflows/ci.yml

@@ -39,10 +39,10 @@ jobs:
             .tox
             ~/.cache/pip
           key: "${{ matrix.testenv }}-${{ hashFiles('misc/requirements/requirements-*.txt') }}-${{ hashFiles('requirements.txt') }}"
-      - uses: actions/setup-python@v2.1.3
+      - uses: actions/setup-python@v2
         with:
           python-version: '3.8'
-      - uses: actions/setup-node@v2.1.2
+      - uses: actions/setup-node@v2-beta
         with:
           node-version: '12.x'
         if: "matrix.testenv == 'eslint'"
@@ -157,7 +157,7 @@ jobs:
             ~/.cache/pip
           key: "${{ matrix.testenv }}-${{ matrix.os }}-${{ matrix.python }}-${{ hashFiles('misc/requirements/requirements-*.txt') }}-${{ hashFiles('requirements.txt') }}"
       - name: Set up Python
-        uses: actions/setup-python@v2.1.3
+        uses: actions/setup-python@v2
         with:
           python-version: "${{ matrix.python }}"
       - name: Set up problem matchers
@@ -178,7 +178,7 @@ jobs:
         if: "failure()"
       - name: Upload coverage
         if: "endsWith(matrix.testenv, '-cov')"
-        uses: codecov/codecov-action@v1.0.13
+        uses: codecov/codecov-action@v1
         with:
           name: "${{ matrix.testenv }}"
 

.github/workflows/recompile-requirements.yml

@@ -20,11 +20,11 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Set up Python 3.7
-        uses: actions/setup-python@v2.1.3
+        uses: actions/setup-python@v2
         with:
           python-version: '3.7'
       - name: Set up Python 3.8
-        uses: actions/setup-python@v2.1.3
+        uses: actions/setup-python@v2
         with:
           python-version: '3.8'
       - name: Recompile requirements