[code-infra] Update changelog script (mui#16218)

scripts/releaseChangelog.mjs

@@ -358,7 +358,7 @@ ${logTeamSection()}
 ${logChangelogMessages('DataGrid')}
 #### \`@mui/x-data-grid@__VERSION__\`
 
-${logChangelogSection(dataGridCommits) || `No changes since \`@mui/x-data-grid@${lastRelease}\`.`}
+${logChangelogSection(dataGridCommits) || 'Internal changes.'}
 
 #### \`@mui/x-data-grid-pro@__VERSION__\` [![pro](https://mui.com/r/x-pro-svg)](https://mui.com/r/x-pro-svg-link 'Pro plan')
 
@@ -376,7 +376,7 @@ ${logChangelogSection(dataGridPremiumCommits)}${dataGridPremiumCommits.length >
 ${logChangelogMessages('pickers')}
 #### \`@mui/x-date-pickers@__VERSION__\`
 
-${logChangelogSection(pickersCommits) || `No changes since \`@mui/x-date-pickers@${lastRelease}\`.`}
+${logChangelogSection(pickersCommits) || 'Internal changes.'}
 
 #### \`@mui/x-date-pickers-pro@__VERSION__\` [![pro](https://mui.com/r/x-pro-svg)](https://mui.com/r/x-pro-svg-link 'Pro plan')
 
@@ -388,7 +388,7 @@ ${logChangelogSection(pickersProCommits)}${pickersProCommits.length > 0 ? '\n' :
 ${logChangelogMessages('charts')}
 #### \`@mui/x-charts@__VERSION__\`
 
-${logChangelogSection(chartsCommits) || `No changes since \`@mui/x-charts@${lastRelease}\`.`}
+${logChangelogSection(chartsCommits) || 'Internal changes.'}
 
 #### \`@mui/x-charts-pro@__VERSION__\` [![pro](https://mui.com/r/x-pro-svg)](https://mui.com/r/x-pro-svg-link 'Pro plan')
 
@@ -397,7 +397,7 @@ ${logChangelogSection(chartsProCommits)}${chartsProCommits.length > 0 ? '\n' : '
 ### Tree View
 ${logChangelogMessages('TreeView')}
 #### \`@mui/x-tree-view@__VERSION__\` 
-${logChangelogSection(treeViewProCommits) || `No changes since \`@mui/x-tree-view-pro@${lastRelease}\`.`}
+${logChangelogSection(treeViewProCommits) || 'Internal changes.'}
 
 #### \`@mui/x-tree-view-pro@__VERSION__\` [![pro](https://mui.com/r/x-pro-svg)](https://mui.com/r/x-pro-svg-link 'Pro plan')