chore(deps): update actions/checkout action to v3 (#234)

Author: renovate-bot

.github/workflows/conformance.yml

@@ -17,7 +17,7 @@ jobs:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
 
     - name: Checkout code
-      uses: actions/checkout@dc323e67f16fb5f7663d20ff7941f27f5809e9b6 # v2.6.0
+      uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
 
     - name: Setup Python
       uses: actions/setup-python@75f3110429a8c05be0e1bf360334e4cced2b63fa # v2.3.3

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
       with:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
 
-    - uses: actions/checkout@dc323e67f16fb5f7663d20ff7941f27f5809e9b6 # v2.6.0
+    - uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
     - name: Setup Python
       uses: actions/setup-python@75f3110429a8c05be0e1bf360334e4cced2b63fa # v2.3.3
     - name: Install tox

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
           egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
 
       - name: Checkout
-        uses: actions/checkout@dc323e67f16fb5f7663d20ff7941f27f5809e9b6 # v2.6.0
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
         with:
           ref: ${{ github.event.release.tag_name }}
       - name: Install Python

.github/workflows/unit.yml

@@ -17,7 +17,7 @@ jobs:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
 
     - name: Checkout
-      uses: actions/checkout@dc323e67f16fb5f7663d20ff7941f27f5809e9b6 # v2.6.0
+      uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
     - name: Use Python ${{ matrix.python }}
       uses: actions/setup-python@75f3110429a8c05be0e1bf360334e4cced2b63fa # v2.3.3
       with: