prepare next version: update regexes (bevyengine#14170)

# Objective

- The post release version bump job failed:
https://github.com/bevyengine/bevy/actions/runs/9799332118
- This is because main didn't update to 0.14 as that happened in a
branch

## Solution

- Update the regexes to work with the -dev suffix

---------

Co-authored-by: Jan Hohenheim <[email protected]>

.github/workflows/post-release.yml

@@ -27,9 +27,9 @@ jobs:
           # Read the current version from Cargo.toml
           current_version=$(cargo metadata --format-version 1 --no-deps | \
             jq --raw-output '.packages | .[] | select(.name == "bevy").version')
-          # Sanity check: current version should be 0.X.Y
-          if ! grep -q '^0\.[0-9]\+\.[0-9]\+$' <<< "${current_version}"; then
-            echo "Invalid version (not in 0.X.Y format): ${current_version}"
+          # Sanity check: current version should be 0.X.Y-dev
+          if ! grep -q '^0\.[0-9]\+\.[0-9]\+-dev$' <<< "${current_version}"; then
+            echo "Invalid version (not in 0.X.Y-dev format): ${current_version}"
             exit 1
           fi
           minor_version=$(sed 's/^0\.\([0-9]\+\).*/\1/' <<< "${current_version}")