Fix bump-version.ps1 shebang for pwsh compatibility

Author: jaredthirsk

build/bump-version.ps1

@@ -1,3 +1,4 @@
+#!/usr/bin/env pwsh
 # Script to bump version numbers for HudClock
 param(
     [Parameter(Mandatory=$true)]
@@ -107,4 +108,4 @@ if (-not $Push) {
 Write-Host @"
   - Monitor CI/CD: https://github.com/lionfire/hudclock/actions
   - View releases: https://github.com/lionfire/hudclock/releases
-"@ -ForegroundColor Yellow
+"@ -ForegroundColor Yellow