ci: fix pre-release gate (release_created is empty, not 'false')

release-please-action sets `release_created` to 'true' or leaves it
empty — never the literal 'false'. The prerelease-version job gated on
`== 'false'`, so it (and prerelease-build/prerelease-publish) was
skipped on every non-release merge to main. Gate on `!= 'true'` instead,
which matches both the empty and 'false' cases.

Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

.github/workflows/release.yml

@@ -95,7 +95,9 @@ jobs:
   # ─────────────────────────────────────────────────────────────
   prerelease-version:
     needs: release-please
-    if: needs.release-please.outputs.release_created == 'false' && github.event_name == 'push'
+    # release-please-action sets release_created to 'true' or leaves it empty
+    # (never the literal 'false'), so gate on != 'true', not == 'false'.
+    if: needs.release-please.outputs.release_created != 'true' && github.event_name == 'push'
     runs-on: ubuntu-latest
     permissions:
       contents: write