CI: update scijava-scripts main branch references

Author: ctrueden

.github/build.sh

@@ -7,7 +7,7 @@ if [ -f release.properties ]; then
 fi
 
 # Run the SciJava CI build script.
-curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/master/ci-build.sh &&
+curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/main/ci-build.sh &&
 sh ci-build.sh || { echo "Maven build failed. Skipping melting pot tests."; exit 1; }
 
 # Skip melting pot if cutting a release.

.github/setup.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/master/ci-setup-github-actions.sh
+curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/main/ci-setup-github-actions.sh
 sh ci-setup-github-actions.sh
 
 # Install needed packages.