fix: report new version when commit is false and no version files update

`outputs.version` is sourced from `cz version --project` after the
bump. When `commit: false` is combined with a `version_provider` that
does not write to any tracked file (notably `version_provider = "scm"`),
the bump does not update any version file and does not create a git
tag, so `cz version --project` keeps reporting the previous version.
The action then exposes the old version on `outputs.version`,
`outputs.next_version` and the major/minor variants, even though the
bump command itself printed `bump: version X -> Y` correctly.

Capture the next version with `cz bump --get-next` before running
the actual bump (it is a calculation, no state change), and use it as
a fallback when `cz version --project` still equals the previous
version after the bump. Major/minor are derived from the same value so
they match. Failures of `--get-next` (e.g. no bumpable commits) are
tolerated and leave the existing behaviour untouched.

Closes #94

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bearomorphism

entrypoint.sh

@@ -94,6 +94,14 @@ fi
 if [[ $INPUT_MANUAL_VERSION ]]; then
   CZ_CMD+=("$INPUT_MANUAL_VERSION")
 fi
+
+# Capture the would-be next version BEFORE running the actual bump.
+# This is used as a fallback for the version output when `cz version --project`
+# does not reflect the bump (e.g. version_provider=scm combined with
+# commit:false, where neither version files nor git tags are updated).
+# Failures (no bumpable commits, etc.) are tolerated and produce an empty value.
+NEXT_REV_PRE="$("${CZ_CMD[@]}" --get-next 2>/dev/null || true)"
+
 if [[ $INPUT_CHANGELOG_INCREMENT_FILENAME ]]; then
   CZ_CMD+=('--changelog-to-stdout')
   echo "${CZ_CMD[@]}" ">$INPUT_CHANGELOG_INCREMENT_FILENAME"
@@ -109,17 +117,29 @@ else
 fi
 
 REV="$(cz version --project)"
+NEXT_REV_MAJOR="$(cz version --project --major)"
+NEXT_REV_MINOR="$(cz version --project --minor)"
+
+# Fall back to the pre-computed --get-next value when `cz version --project`
+# did not reflect the bump. This happens with version_provider=scm and
+# commit:false, where the bump does not update any tracked files and no
+# tag is created, so the project's reported version remains unchanged.
+if [[ $REV == "$PREV_REV" && -n "$NEXT_REV_PRE" && "$NEXT_REV_PRE" != "$PREV_REV" ]]; then
+  REV="$NEXT_REV_PRE"
+  NEXT_REV_MAJOR="${REV%%.*}"
+  NEXT_REV_REST="${REV#*.}"
+  NEXT_REV_MINOR="${NEXT_REV_REST%%.*}"
+fi
+
 if [[ $REV == "$PREV_REV" ]]; then
   INPUT_PUSH='false'
 fi
 echo "REVISION=${REV}" >>"$GITHUB_ENV"
 echo "version=${REV}" >>"$GITHUB_OUTPUT"
 echo "next_version=${REV}" >>"$GITHUB_OUTPUT"
 
-NEXT_REV_MAJOR="$(cz version --project --major)"
 echo "NEXT_REVISION_MAJOR=${NEXT_REV_MAJOR}" >>"$GITHUB_ENV"
 echo "next_version_major=${NEXT_REV_MAJOR}" >>"$GITHUB_OUTPUT"
-NEXT_REV_MINOR="$(cz version --project --minor)"
 echo "NEXT_REVISION_MINOR=${NEXT_REV_MINOR}" >>"$GITHUB_ENV"
 echo "next_version_minor=${NEXT_REV_MINOR}" >>"$GITHUB_OUTPUT"