Add support for impersonating Firefox 100

Add support for impersonating Firefox 100. The TLS signature is identical to
previous versions of Firefox.

In addition, upgrade NSS (Firefox's TLS library) to version 3.77 used by
Firefox 100. This is not strictly necessary as the previous version used
works just fine, but it's better keep up with the newest version.

tests/test_impersonate.py

@@ -138,6 +138,7 @@ class TestImpersonation:
         ("curl_ff91esr", None, None, "firefox_91.6.0esr_win10"),
         ("curl_ff95", None, None, "firefox_95.0.2_win10"),
         ("curl_ff98", None, None, "firefox_98.0_win10"),
+        ("curl_ff100", None, None, "firefox_100.0_win10"),
 
         # Test libcurl-impersonate by loading it with LD_PRELOAD to an app
         # linked against the regular libcurl and setting the
@@ -213,6 +214,14 @@ class TestImpersonation:
             },
             "libcurl-impersonate-ff",
             "firefox_98.0_win10"
+        ),
+        (
+            "minicurl",
+            {
+                "CURL_IMPERSONATE": "ff100"
+            },
+            "libcurl-impersonate-ff",
+            "firefox_100.0_win10"
         )
     ]