Fix version parser regex for packaging

This fixes the version parser regex to allow it to handle double digit major/minor/patch
values. It fixes the FileVersion added to Windows exe files.

CHANGELOG.next.asciidoc

@@ -215,6 +215,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fixed documentation for commands in beats dev guide {pull}22194[22194]
 - Fix parsing of expired licences. {issue}21112[21112] {pull}22180[22180]
 - Fix duplicated pod events in kubernetes autodiscover for pods with init or ephemeral containers. {pull}22438[22438]
+- Fix FileVersion contained in Windows exe files. {pull}22581[22581]
 
 *Auditbeat*
 

dev-tools/mage/common.go

@@ -782,7 +782,7 @@ func binaryExtension(goos string) string {
 	return ""
 }
 
-var parseVersionRegex = regexp.MustCompile(`(?m)^[^\d]*(?P<major>\d)+\.(?P<minor>\d)+(?:\.(?P<patch>\d)+.*)?$`)
+var parseVersionRegex = regexp.MustCompile(`(?m)^[^\d]*(?P<major>\d+)\.(?P<minor>\d+)(?:\.(?P<patch>\d+).*)?$`)
 
 // ParseVersion extracts the major, minor, and optional patch number from a
 // version string.

dev-tools/mage/common_test.go

@@ -33,6 +33,8 @@ func TestParseVersion(t *testing.T) {
 		{"1.2.3-SNAPSHOT", 1, 2, 3},
 		{"1.2.3rc1", 1, 2, 3},
 		{"1.2", 1, 2, 0},
+		{"7.10.0", 7, 10, 0},
+		{"10.01.22", 10, 1, 22},
 	}
 
 	for _, tc := range tests {