CI: add explicit permissions to workflows #346

Job	Run time
all-features	5m 45s
build (linux)	5m 15s
build (macos)	7m 52s
build (windows)	7m 5s
long-tests	8m 34s
test-bindings-c-cpp-linux	2m 32s
test-bindings-c-cpp-windows (Debug-c, x86_64-pc-windows-msvc)	4m 0s
test-bindings-c-cpp-windows (Debug-c, i686-pc-windows-msvc)	5m 39s
test-bindings-c-cpp-windows (Release-c, x86_64-pc-windows-msvc)	4m 51s
test-bindings-c-cpp-windows (Release-c, i686-pc-windows-msvc)	7m 14s
test-bindings-c-cpp-windows (Debug-cpp, x86_64-pc-windows-msvc)	4m 35s
test-bindings-c-cpp-windows (Debug-cpp, i686-pc-windows-msvc)	6m 28s
test-bindings-c-cpp-windows (Release-cpp, x86_64-pc-windows-msvc)	4m 14s
test-bindings-c-cpp-windows (Release-cpp, i686-pc-windows-msvc)	7m 19s
afl-build	6m 21s
audit	1m 1s
clippy	3m 7s
fmt	19s
	1h 32m 11s

Provide feedback