Issue #11637: Resolve shellcheck SC2026

.ci/validation.sh

@@ -42,7 +42,7 @@ check-missing-pitests)
 
   list=($(cat pom.xml | \
     xmlstarlet sel --ps -N pom="http://maven.apache.org/POM/4.0.0" \
-    -t -v '//pom:profile[./pom:id[contains(text(),'pitest')]]//pom:targetClasses/pom:param'))
+    -t -v "//pom:profile[./pom:id[contains(text(),'pitest')]]//pom:targetClasses/pom:param"))
 
   #  Temporary skip for Metadata generator related files for
   #  https://github.com/checkstyle/checkstyle/issues/8761

.shellcheckrc

@@ -22,6 +22,5 @@ disable=SC2063 # (warning): Grep uses regex, but this looks like a glob.
 disable=SC2126 # (style): Consider using grep -c instead of grep|wc -l.
 disable=SC2005 # (style): Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.
 disable=SC2015 # (info): Note that A && B || C is not if-then-else. C may run when A is true.
-disable=SC2026 # (info): This word is outside of quotes.
 disable=SC2230 # which is non-standard. Use builtin 'command -v' instead.
 disable=SC2153 # Possible misspelling: LINKED_ISSUES may not be assigned, but LINKED_ISSUE is.