fix(Renovate): Only prepend "v" when missing

We prepend "v" to the "from" version number,
`currentVersion`, for consistency with the "to"
version number, `prettyNewVersion`, because
Renovate doesn't expose a `prettyCurrentVersion`.
However, an upstream change recently caused
`currentVersion` to start with a "v" when bumping
Node.js. Hence, only prepend a "v" to a semantic
version number that doesn't start with "v".

default.json

@@ -12,7 +12,7 @@
   "commitBodyTable": true,
   "commitMessageAction": "Bump",
   "commitMessageExtra": "to {{#if isPinDigest}}{{{newDigestShort}}}{{else}}{{#if isSingleVersion}}{{prettyNewVersion}}{{else}}{{#if newValue}}{{{newValue}}}{{else}}{{{newDigestShort}}}{{/if}}{{/if}}{{/if}}",
-  "commitMessageTopic": "{{depName}} from {{#if isPinDigest}}{{{currentDigestShort}}}{{else}}{{#if isSingleVersion}}v{{currentVersion}}{{else}}{{#if newValue}}{{{currentValue}}}{{else}}{{{currentDigestShort}}}{{/if}}{{/if}}{{/if}}",
+  "commitMessageTopic": "{{depName}} from {{#if isPinDigest}}{{{currentDigestShort}}}{{else}}{{#if isSingleVersion}}{{replace '^(?<version>(\\d+\\.){2}\\d+)' 'v$<version>' currentVersion}}{{else}}{{#if newValue}}{{{currentValue}}}{{else}}{{{currentDigestShort}}}{{/if}}{{/if}}{{/if}}",
   "configWarningReuseIssue": false,
   "dependencyDashboardApproval": true,
   "dependencyDashboardLabels": ["dependencies"],