chore: add Ruby 3.2.7 support; make Ruby 3.3.7 default version #1084

Job	Run time
build-gem	9s
Use gem to package fontist windows-latest Ruby 3.3.7 CC gcc	2m 8s
Use gem to package metanorma alpine:3.17 Ruby 3.3.7 CC gcc	2m 6s
Use gem to package metanorma ubuntu-20.04 Ruby 3.3.7 CC clang-12	2m 19s
Use gem to package metanorma macos-13 Ruby 3.3.7 CC clang	51s
Use gem to package fontist alpine:3.17 Ruby 3.3.7 CC gcc	2m 7s
Use gem to package fontist ubuntu-20.04 Ruby 3.3.7 CC clang-12	2m 18s
Use gem to package fontist macos-13 Ruby 3.3.7 CC clang	1m 32s
Use gem to package metanorma macos-14 Ruby 3.3.7 CC clang	52s
Use gem to package fontist macos-14 Ruby 3.3.7 CC clang	46s
cross-test on ${{ matrix.os }}	1s
Release gem	1s
	15m 10s

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