Fix repository_owner condition docs_deploy gha job (Qiskit#10635)

This commit fixes an issue in the job definition for the new docs
deployment job added in Qiskit#10610. The new jobs are conditioned to only
execute from the Qiskit/qiskit-terra repo. However that line is being
flagged as a syntax error in github. This seems to be due to the double
quotes used for `"Qiskit"`. A similar condition exists on the
pre-existing github actions jobs but they use a single quote instead of
a double and they function correctly. This commit updates the condition
to used single quotes to match the working syntax in other jobs.

.github/workflows/docs_deploy.yml

@@ -23,7 +23,7 @@ on:
 
 jobs:
   build:
-    if: github.repository_owner == "Qiskit"
+    if: github.repository_owner == 'Qiskit'
     name: Build
     runs-on: ubuntu-latest