Move git tag fetching to release notes job

It was added to the wrong job originally [0].

[0]: https://review.opendev.org/c/airship/airshipctl/+/780940

Change-Id: I023bf1b8f0e133f190dc320bf45e4c79efd5de2b
Signed-off-by: Sean Eagan <seaneagan1@gmail.com>

.github/workflows/release.yaml

@@ -29,8 +29,6 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
       - name: Calculate semver tags
         id: semver_tags
         run: |
@@ -96,6 +94,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
       - name: Download release notes utility
         run: |
           sudo npm install github-release-notes -g