Bump actions/cache from v2.1.4 to v2.1.5

Bumps [actions/cache](https://github.com/actions/cache) from v2.1.4 to v2.1.5.
- [Release notes](https://github.com/actions/cache/releases)
- [Commits](actions/cache@v2.1.4...1a9e213)

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/py-dead-code.yml

@@ -20,7 +20,7 @@ jobs:
           python-version: '3.8'
 
       - name: "Cache pip"
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.5
         with:
           # This path is specific to Ubuntu
           path: ~/.cache/pip

.github/workflows/py-test.yml

@@ -26,7 +26,7 @@ jobs:
           python-version: '3.8'
 
       - name: "Cache pip"
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.5
         with:
           # This path is specific to Ubuntu
           path: ~/.cache/pip
@@ -85,7 +85,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
 
       - name: "Cache pip"
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.5
         with:
           # This path is specific to Ubuntu
           path: ~/.cache/pip

.github/workflows/release.yml

@@ -62,7 +62,7 @@ jobs:
           python-version: 3.9
 
       - name: "Cache pip"
-        uses: actions/cache@v2.1.4
+        uses: actions/cache@v2.1.5
         with:
           # This path is specific to Ubuntu
           path: ~/.cache/pip